# List of consulting firms in Turkey

Tamtam tracks 61 consulting firms headquartered in Turkey. This list ranks the 50 largest by number of employees on LinkedIn, led by Mplus Türkiye, KUCUKYiLMAZ Consulting Co. and Innova. Their median headcount is 414. Half of them were founded in 1999 or later. The most common headquarters are Istanbul (26) and Ankara (6).

This list of consulting firms in Turkey includes a mix of large groups and mid-sized firms, with a strong presence in IT services, engineering, and business consulting. Companies like Innova, BGTS, and OBSS specialize in IT solutions, software development, and technology consulting. Engineering firms such as Yüksel Proje and EMAY INTERNATIONAL ENGINEERING and CONSULTANCY Inc. focus on civil engineering, transportation, and infrastructure projects. Professional services are represented by KPMG Türkiye, PwC Türkiye, and Deloitte Turkey, offering audit, tax, and advisory services. Mplus Türkiye provides outsourcing and offshoring consulting with a focus on customer management.

A notable pattern among these firms is their geographic distribution, with a significant concentration of headquarters in Istanbul, including Mplus Türkiye, Innova, and KPMG Türkiye. Ankara also hosts several major firms, such as STM, which provides defense and space manufacturing consulting, and Yüksel Proje, a civil engineering consultancy. Many of these companies were founded between the late 1970s and early 2000s, indicating a period of growth and establishment for the consulting sector in Turkey.

🇹🇷 Turkey · 50 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Mplus Türkiye](https://www.tamtam.ai/c/mplus-turkiye) (mplusgroup.eu)<br>Leading outsourcing provider offering CRM and AI-based solutions in 33 languages across Turkey and Europe, with a focus on customer management and satisfaction | Outsourcing and Offshoring Consulting | 🇹🇷 Istanbul | 2,650 | 2000 |
| 2 | [KUCUKYiLMAZ Consulting Co.](https://www.tamtam.ai/c/kucukyilmaz-consulting-co) (facebook.com)<br>With 25 years of experience in the friction industry, offering assistance in compounding, process, product, and business development, representing major suppliers | Motor Vehicle Manufacturing | 🇹🇷 Istanbul | 2,363 | 2004 |
| 3 | [Innova](https://www.tamtam.ai/c/innova-istanbul) (innova.com.tr)<br>Leading Turkish IT solutions provider with 1400 professionals offering platform-independent solutions in various sectors, exporting solutions to 33 countries across 3 continents | IT Services and IT Consulting | 🇹🇷 Istanbul | 2,115 | 1999 |
| 4 | [Metro Istanbul](https://www.tamtam.ai/c/metro-istanbul) (metro.istanbul)<br>Operates and expands urban rail systems in Istanbul, providing efficient transportation services, maintenance, and engineering consultancy for future projects domestically and internationally | Rail Transportation | 🇹🇷 Yavuz Selim | 1,799 | 1988 |
| 5 | [STM](https://www.tamtam.ai/c/stm) (stm.com.tr)<br>Provides high technology project management, engineering, and consultancy services for military systems, developing domestic software and platforms for defense industry procurement operations. | Defense and Space Manufacturing | 🇹🇷 Ankara | 1,537 | 1991 |
| 6 | [KPMG Türkiye](https://www.tamtam.ai/c/kpmg-turkiye) (kpmg.com)<br>Providing audit, tax, and advisory services to diverse industries with a sector-focused approach and extensive local and international expertise. | Business Consulting and Services | 🇹🇷 Istanbul | 1,446 | 1982 |
| 7 | [Ünsped Gümrük Müşavirliği ve Lojistik Hizmetler A.Ş.](https://www.tamtam.ai/c/unsped-gumruk-musavirligi-ve-lojistik-hizmetler-a-s) (ugm.com.tr)<br>Specializing in international trade logistics and customs services, the company provides quality solutions with a focus on innovation and customer satisfaction | Wholesale Import and Export | 🇹🇷 Mahmutbey | 1,412 | 1981 |
| 8 | [TCDD Teknik Mühendislik ve Müşavirlik A.Ş.](https://www.tamtam.ai/c/tcdd-teknik-muhendislik-ve-musavirlik-a-s) (tcddteknik.com.tr)<br>A government-owned engineering firm specializing in engineering, consultancy, technology, signaling, energy, certification, and measurement services in various fields | Railroad Equipment Manufacturing | 🇹🇷 Ankara | 1,361 | 2017 |
| 9 | [Yüksel Proje](https://www.tamtam.ai/c/yuksel-proje) (yukselproje.com.tr)<br>A leading provider of design, engineering, and consultancy services for various sectors worldwide, with a focus on sustainable and innovative projects | Civil Engineering | 🇹🇷 Ankara | 1,284 | 1978 |
| 10 | [PwC Türkiye](https://www.tamtam.ai/c/pwc-turkiye) (pwc.com.tr)<br>A global network providing quality assurance, advisory, and tax services with a focus on building trust and solving important issues | Professional Services | 🇹🇷 Beyoglu | 1,277 | 1981 |
| 11 | [BGTS](https://www.tamtam.ai/c/bgts) (bilgeadam.com)<br>An international technology consulting firm specializing in software development, IT consulting, business processes, QA & testing, big data, cloud, AI/ML, and cybersecurity services | IT Services and IT Consulting | 🇹🇷 Istanbul | 1,182 | 1997 |
| 12 | [Deloitte Turkey](https://www.tamtam.ai/c/deloitte-turkey) (deloitte.com.tr)<br>The company provides audit, consulting, financial advisory, risk management, tax services to public and private clients across various industries globally | Management Consulting | 🇹🇷 Istanbul | 978 |  |
| 13 | [OBSS](https://www.tamtam.ai/c/obss) (obss.tech)<br>Leader in technology consulting for a cloud-powered future, with expertise in banking, insurance, e-commerce, retail, and start-ups Strong team with offices in Europe | IT Services and IT Consulting | 🇹🇷 Istanbul | 870 | 2005 |
| 14 | [Özel bir danışmanlık şirketi](https://www.tamtam.ai/c/ozel-bir-dan-smanl-k-sirketi) (kml.com.tr)<br>Strategic planning, brand management, marketing, sales management, R&D, innovation, HR, supply chain, quality management, IT, corporate governance, digital transformation, corporate training | Business Consulting and Services | 🇹🇷 Istanbul | 705 | 2019 |
| 15 | [EMAY INTERNATIONAL ENGINEERING and CONSULTANCY Inc.](https://www.tamtam.ai/c/emay-international-engineering-and-consultancy-inc) (emay.com)<br>A leading engineering and consultancy firm in Turkey, offering services in transportation, buildings, and water & environment sectors with a focus on architectural and engineering projects | Design Services | 🇹🇷 Üsküdar | 704 | 1980 |
| 16 | [Data Gümrük Müşavirliği](https://www.tamtam.ai/c/data-gumruk-musavirligi) (datagumrukleme.com)<br>A logistics business that has expanded its services and branches, focusing on customer satisfaction with modern management techniques and technological infrastructure | Business Consulting and Services | 🇹🇷 Izmir | 703 | 2003 |
| 17 | [DIP](https://www.tamtam.ai/c/dip) (dip.com)<br>Specializing in Data & Analytics solutions, creating custom solutions for organizations, providing consulting services in data transformation, analysis, and management processes | IT Services and IT Consulting | 🇹🇷 Istanbul | 702 | 2012 |
| 18 | [adesso Turkey](https://www.tamtam.ai/c/adesso-turkey) (adesso.com.tr)<br>A digital transformation company with agile beliefs, employing over 10,000 people worldwide, offering custom software development and IT solutions | IT Services and IT Consulting | 🇹🇷 Istanbul | 628 | 2013 |
| 19 | [Commencis](https://www.tamtam.ai/c/commencis) (commencis.com)<br>A company specializing in experience design, software engineering, and cloud technologies, enabling enterprises to build digital experiences and strengthen customer relationships globally | Software Development | 🇹🇷 Istanbul | 542 | 2000 |
| 20 | [Innovance Consultancy](https://www.tamtam.ai/c/innovance-consultancy) (innovance.com.tr)<br>Innovance provides technology solutions and expertise to help clients capitalize on digitization opportunities, achieve profitability, and scale their businesses globally | IT Services and IT Consulting | 🇹🇷 Maslak | 538 | 2017 |
| 21 | [Academy](https://www.tamtam.ai/c/academy) (inkaik.com)<br>Specializing in HR research, selection, project-based staffing, HR consultancy, management consultancy, and payroll services with a focus on professionalism and confidentiality | Human Resources Services | 🇹🇷 Istanbul | 537 |  |
| 22 | [Testinium](https://www.tamtam.ai/c/testinium) (testinium.com)<br>Innovative team providing software consulting, test outsourcing, and training services with expertise in various testing approaches and frameworks | IT Services and IT Consulting | 🇹🇷 Istanbul | 492 | 2010 |
| 23 | [TÜMAŞ TÜRK MÜHENDİSLİK, MÜŞAVİRLİK VE MÜTEAHHİTLİK A.Ş.](https://www.tamtam.ai/c/tumas-turk-muhendislik-musavirlik-ve-muteahhitlik-a-s) (tumas.com.tr)<br>Providing pre-project planning, design, engineering, consultancy, and construction services for all project stages, including tendering, supervision, and post-implementation services | Design Services | 🇹🇷 Çankaya | 471 | 1969 |
| 24 | [Detaysoft](https://www.tamtam.ai/c/detaysoft) (detaysoft.com)<br>Leader in SAP solutions, driving digital transformation through R&D, expert consultants, and global partnerships Trusted by 300+ clients with 1000+ successful projects worldwide | Software Development | 🇹🇷 Istanbul | 444 | 1999 |
| 25 | [BDO Türkiye](https://www.tamtam.ai/c/bdo-turkiye) (bdo.com.tr)<br>An audit and consultancy organization providing professional services in Audit & Assurance, Tax, Social Security, Accounting, and Advisory across the globe | Accounting | 🇹🇷 Istanbul | 414 | 1981 |
| 26 | [DefineX](https://www.tamtam.ai/c/definex) (teamdefinex.com)<br>A forward-thinking consulting house and venture builder focused on digital acceleration, innovation, and cultivating talent for the success of tomorrow | Business Consulting and Services | 🇹🇷 Istanbul | 405 | 2019 |
| 27 | [NKY Architects and Engineers](https://www.tamtam.ai/c/nky-architects-and-engineers) (nky.com.tr)<br>Specialized in project management and design for hospitals and educational facilities, providing professional services worldwide with a focus on quality development | Architecture and Planning | 🇹🇷 Çankaya | 405 | 1975 |
| 28 | [YKS](https://www.tamtam.ai/c/yks) (yks.com.tr)<br>Specializing in sectoral informing, our team expands knowledge in facilities and property management, offering reports and services in energy, waste, security, and more | Business Consulting and Services | 🇹🇷 Istanbul | 400 | 1988 |
| 29 | [SIGMA](https://www.tamtam.ai/c/sigma) (sigmamuhendislik.com.tr)<br>With over 30 years of experience, we are a trusted partner in engineering and consulting services for leading organizations in Turkey | Construction | 🇹🇷 Beşiktaş | 394 |  |
| 30 | [KoçZer](https://www.tamtam.ai/c/koczer) (koczer.com)<br>Leader in procurement & supply chain management with 20+ years of experience, providing end-to-end solutions, strategic roadmaps, mass purchases, and technological solutions | Business Consulting and Services | 🇹🇷 Istanbul | 390 | 2003 |
| 31 | [BTC Bilişim Hizmetleri](https://www.tamtam.ai/c/btc-bilisim-hizmetleri) (btc-ag.com.tr)<br>Specializing in IT-focused business consulting, we optimize processes, provide analysis, management support, and design personalized IT environments for clients' long-term development | IT Services and IT Consulting | 🇹🇷 İçerenköy | 383 | 1995 |
| 32 | [UBM ULUSLARARASI BIRLESMIS MUSAVIRLER MUSAVIRLIK HIZMETLERI A.Ş](https://www.tamtam.ai/c/ubm-uluslararasi-birlesmis-musavirler-musavirlik-hizmetleri-a-s) (ubm.com.tr)<br>A leading technical consultancy specializing in environmental, infrastructure, and transportation projects, with expertise in financial analysis and project management | Civil Engineering | 🇹🇷 Çankaya | 377 | 1950 |
| 33 | [Prokon Mühendislik ve Müşavirlik A.Ş.](https://www.tamtam.ai/c/prokon-muhendislik-ve-musavirlik-a-s) (prokon.com.tr)<br>Specializing in design, engineering, and consultancy services for a wide range of industrial projects worldwide with a focus on quality and innovation | Civil Engineering | 🇹🇷 Kahramankazan | 370 | 1974 |
| 34 | [Nagarro + MBIS](https://www.tamtam.ai/c/nagarro-mbis) (nagarro.com.tr)<br>Leading digital engineering and consulting firm offering innovative solutions for digital transformation, specializing in SAP services for global markets | IT Services and IT Consulting | 🇹🇷 Istanbul | 369 | 2000 |
| 35 | [Sistem Global Danışmanlık A.Ş.](https://www.tamtam.ai/c/sistem-global-dan-smanl-k-a-s) (sistemglobal.com.tr)<br>Provider of financial, legal, and consultancy services for technology companies, specializing in corporate finance, tax, audit, patents, and international funds | Business Consulting and Services | 🇹🇷 Istanbul | 368 | 1996 |
| 36 | [E Mali Müşavirlik](https://www.tamtam.ai/c/e-mali-musavirlik) (emusavirlik.com)<br>Specializing in advisory services in Mali, providing expert guidance and consulting solutions to clients | Financial Services | 🇹🇷 Istanbul | 345 | 2015 |
| 37 | [Grant Thornton Türkiye](https://www.tamtam.ai/c/grant-thornton-turkiye) (grantthornton.com.tr)<br>An international organization with about 250 professionals in Istanbul, Ankara, and Bursa, providing independent audit, tax, accounting, and advisory services since 1986 | Accounting | 🇹🇷 Maslak | 336 | 1986 |
| 38 | [Forvis Mazars Türkiye](https://www.tamtam.ai/c/forvis-mazars-turkiye) (forvismazars.com)<br>Global professional services firm serving over 1,500 companies worldwide with a team of 350+ professionals across multiple offices, committed to highest standards and ethics | Accounting | 🇹🇷 Istanbul | 334 | 1977 |
| 39 | [FEV Türkiye](https://www.tamtam.ai/c/fev-turkiye) (fev.com)<br>A provider of turnkey engineering solutions in the automotive industry, specializing in vehicle development, software, autonomous driving, and propulsion systems | Motor Vehicle Manufacturing | 🇹🇷 Istanbul | 330 | 2011 |
| 40 | [Solvia Digital Solutions](https://www.tamtam.ai/c/solvia-digital-solutions) (solviads.com)<br>Design, integrate, and optimize SAP and IT solutions to enhance agility, resilience, and long-term digital transformation for businesses. | IT Services and IT Consulting | 🇹🇷 Istanbul | 318 | 2014 |
| 41 | [Uniarch Klinik Mühendislik ve Klinik Alan Tasarım A.Ş](https://www.tamtam.ai/c/uniarch-klinik-muhendislik-ve-klinik-alan-tasar-m-a-s) (uniarch.com.tr)<br>Uniarch aims to provide secure and efficient healthcare services by offering consultancy, planning, and project services for the design, technology selection, and operations of healthcare facilities | Hospitals | 🇹🇷 Kartal | 317 |  |
| 42 | [SPA MÜHENDİSLİK](https://www.tamtam.ai/c/spa-muhendislik) (spalinetr.com)<br>Specializing in terminal operation systems in the fuel and chemical industry, designing fire systems, and providing risk analysis solutions for process safety | Engineering Services | 🇹🇷 Ankara | 316 |  |
| 43 | [DETAM Sirketler Grubu](https://www.tamtam.ai/c/detam-sirketler-grubu) (detam.com.tr)<br>A leading consultancy group in Turkey providing a wide range of services in occupational health, safety, environmental services, legal consulting, and HR | Business Consulting and Services | 🇹🇷 Ankara | 284 | 1996 |
| 44 | [RİSUS INTERNATIONAL](https://www.tamtam.ai/c/risus-international) (risusinternational.com)<br>Specializing in change management, analysis, and training services to improve organizational performance through customized solutions and development programs | Human Resources Services | 🇹🇷 Istanbul | 244 | 2006 |
| 45 | [VİZYON](https://www.tamtam.ai/c/vizyon) (vizyongrubu.com)<br>Specializing in tax, auditing, and consulting services to provide comprehensive financial guidance and support to clients | Financial Services | 🇹🇷 Istanbul | 233 | 1984 |
| 46 | [Hype](https://www.tamtam.ai/c/hype-sisli) (hype.com.tr)<br>A dynamic team providing strategic planning, online data analysis, advertising management, and marketing consultancy services to over 100 leading brands | Advertising Services | 🇹🇷 Şişli | 213 | 2013 |
| 47 | [Odine](https://www.tamtam.ai/c/odine) (odine.com)<br>Global telecom partner enabling sustainable network transformation with resilient, software-defined networks Offers communication solutions and collaborative partnerships to support evolving telecom companies | IT Services and IT Consulting | 🇹🇷 Istanbul | 205 | 2000 |
| 48 | [SGK& İş Hukuku&İ.K Danışmanlık/Denetim ve Eğitim](https://www.tamtam.ai/c/sgk-and-is-hukuku-and-i-k-dan-smanl-k-denetim-ve-egitim) (ekstracozum.com)<br>Specializing in HR/accounting departments, providing training on labor laws, resolving issues, preventing penalties, and offering consultancy for benefit programs | Human Resources Services | 🇹🇷 Kumburgaz | 199 | 2013 |
| 49 | [ELTEMTEK A.Ş](https://www.tamtam.ai/c/eltemtek-a-s) (eltemtek.com.tr)<br>Providing a wide range of engineering, investment consultancy, operation, system analysis, mapping, and expropriation services nationally and internationally with a focus on environmental sustainability | Utilities | 🇹🇷 Ankara | 186 | 1983 |
| 50 | [Caretta](https://www.tamtam.ai/c/caretta) (caretta.net)<br>A software company offering custom development, IT consultancy, and outsourcing services, specializing in solutions for the pharmaceutical sector, with global quality standards | Software Development | 🇹🇷 Istanbul | 186 | 1997 |

## How this list is built

Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 11, 2026.

## More company lists in Turkey

- [The largest companies in Turkey](https://www.tamtam.ai/l/largest-companies-turkey) (3,556)
- [Multinational companies in Turkey](https://www.tamtam.ai/l/multinational-companies-turkey) (790)
- [Manufacturers in Turkey](https://www.tamtam.ai/l/manufacturers-turkey) (762)
- [Companies with in-house R&D in Turkey](https://www.tamtam.ai/l/r-and-d-companies-turkey) (512)
- [Retail chains in Turkey](https://www.tamtam.ai/l/retail-chains-turkey) (376)
- [Companies with a mobile app in Turkey](https://www.tamtam.ai/l/companies-with-mobile-app-turkey) (312)
- [Corporate groups and holding companies in Turkey](https://www.tamtam.ai/l/holding-companies-turkey) (304)
- [Critical infrastructure operators in Turkey](https://www.tamtam.ai/l/critical-infrastructure-operators-turkey) (282)
- [Public sector organisations in Turkey](https://www.tamtam.ai/l/public-sector-organisations-turkey) (227)
- [Hardware manufacturers in Turkey](https://www.tamtam.ai/l/hardware-companies-turkey) (224)
- [Energy companies in Turkey](https://www.tamtam.ai/l/energy-companies-turkey) (197)
- [Food and beverage companies in Turkey](https://www.tamtam.ai/l/food-and-beverage-companies-turkey) (197)
- [Consumer goods companies in Turkey](https://www.tamtam.ai/l/consumer-goods-companies-turkey) (193)
- [Food and Beverage Manufacturing companies in Turkey](https://www.tamtam.ai/l/food-and-beverage-manufacturing-companies-turkey) (184)
- [Hotel and hospitality groups in Turkey](https://www.tamtam.ai/l/hospitality-groups-turkey) (176)
- [E-commerce companies in Turkey](https://www.tamtam.ai/l/ecommerce-companies-turkey) (172)
- [Higher Education companies in Turkey](https://www.tamtam.ai/l/higher-education-companies-turkey) (158)
- [Food and Beverage Services companies in Turkey](https://www.tamtam.ai/l/food-and-beverage-services-companies-turkey) (149)
- [Family-owned companies in Turkey](https://www.tamtam.ai/l/family-owned-companies-turkey) (137)
- [Financial services firms in Turkey](https://www.tamtam.ai/l/financial-services-firms-turkey) (134)
- [Motor Vehicle Manufacturing companies in Turkey](https://www.tamtam.ai/l/motor-vehicle-manufacturing-companies-turkey) (134)
- [Publicly traded companies in Turkey](https://www.tamtam.ai/l/publicly-traded-companies-turkey) (131)
- [Construction companies in Turkey](https://www.tamtam.ai/l/construction-companies-turkey) (129)
- [Automotive manufacturers and suppliers in Turkey](https://www.tamtam.ai/l/automotive-companies-turkey) (128)

## The same list elsewhere in Turkey

- [Consulting firms in Istanbul](https://www.tamtam.ai/l/consulting-firms-istanbul) (34)

---

Source: https://www.tamtam.ai/l/consulting-firms-turkey