The consulting firms in Sydney listed here are predominantly large, established professional services and IT consulting groups. These companies offer a wide range of expertise, from engineering and environmental solutions to audit, tax, and digital transformation. They cater to diverse industries, including energy, chemicals, resources, and government organizations.
Notable firms include Worley, a global professional services company specializing in energy and resources; GHD, providing integrated solutions in water and energy; KPMG Australia, offering audit, tax, and consulting services; and Deloitte Australia, focused on cybersecurity and digital marketing. Planit is a global leader in quality engineering, while Atturra provides end-to-end IT transformation services.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Worleyworley.com
Global professional services company specializing in energy, chemicals, and resources, providing integrated solutions for project delivery and asset management |
37,425 | |||
| 2 | 17,363 | ||||
| 3 |
KPMG Australiakpmg.com.au
Professional services firm offering audit, tax, legal, management consulting, and digital solutions to diverse industries and sectors in Australia. |
9,429 | |||
| 4 |
Deloitte Australiadeloitte.com.au
A forward-thinking professional services firm focused on cyber security, virtual reality, digital marketing, and tech integration across various industries, aiming to make a meaningful impact |
7,674 | |||
| 5 |
PwC Australiapwc.com.au
Professional services focused on building trust in society and solving important problems through insights and expertise from people. |
5,636 | |||
| 6 |
WSP in Australiawsp.com
A leading professional services consulting firm providing technical expertise and strategic advice in various sectors, designing lasting solutions for future generations with integrated digital innovations |
4,487 | |||
| 7 |
180 Degrees Consulting180dc.org
Global youth-led consultancy for non-profits, governments, and social-conscious organizations, providing consulting services to improve education, reduce homelessness, and alleviate poverty. |
2,365 | |||
| 8 |
Planitplanit.com
Global leader in quality engineering and assurance solutions, empowering businesses to enhance software quality and delivery processes through continuous growth and excellence |
1,931 | |||
| 9 |
Grant Thornton Australiagrantthornton.com.au
Experienced professionals providing audit, assurance, tax, and advisory services with a focus on client care and principled execution. |
1,739 | |||
| 10 | 1,136 | ||||
| 11 |
UBTuniversalbusinessteam.com
Global consulting organization supporting family businesses with business advisory, coaching, and training programs, while also providing support to education, charity, and disaster relief initiatives |
1,079 | |||
| 12 |
Atturraatturra.com
An Australian-based advisory and IT solutions provider offering end-to-end transformation services, including advisory, cloud services, data integration, and managed services, to clients worldwide |
1,049 | |||
| 13 |
NRI Australia & New Zealandnri-anz.com
Provider of transformative digital solutions through strategy, consulting, infrastructure, and managed IT services, with global reach and a passionate, customer-focused team |
846 | |||
| 14 |
Nexon Asia Pacificnexon.com.au
An award-winning digital consulting partner offering end-to-end solutions in security, cloud, and digital services to mid-market, enterprise, and government organizations |
726 | |||
| 15 |
APP Corporationapp.com.au
Consultancy services in property and infrastructure, offering project management, advisory, risk management, and real estate services across Australia. |
677 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 16 |
Expert Education & Visa Servicesexperteducation.com
Global education and migration consulting institution providing honest guidance for studying abroad in Australia, Canada, the US, and the UK |
627 | |||
| 17 |
Logistics Executive Grouplogisticsexecutive.com
A supply chain-focused hub for recruitment, advisory, coaching, and media services, offering solutions for growth and improved performance across various business aspects |
605 | |||
| 18 |
WT (Australia)wtpartnership.com.au
International property, project, and cost management consultants who tailor solutions to meet clients' needs globally through partnerships and independent ownership |
585 | |||
| 19 |
TBHtbhconsultancy.com
Specialized project delivery services ensuring efficient, independent, and ethical management across diverse industries with extensive experience since 1965. |
546 | |||
| 20 |
Partners in Performance, Part of Accenturepip.global
A global management consultancy specializing in driving operational excellence and facilitating lasting organizational change through partnership with clients |
522 | |||
| 21 |
FTS Groupftsg.com.au
An advisory technology consulting firm helping over 600 clients in public and private sectors leverage technology for growth and success |
501 | |||
| 22 |
HPX Grouphpxgroup.com.au
Empowering talented individuals to provide essential corporate services in legal, governance, risk, and compliance to facilitate business growth and success |
495 | |||
| 23 |
Northrop Consulting Engineersnorthrop.com.au
A locally-owned engineering consultancy with expertise in Civil, Structural, Building Services, and Sustainability, delivering successful solutions through a collaborative approach |
490 | |||
| 24 |
JHA Consulting Engineersjhaengineers.com
A multidisciplinary group of engineers and consultants providing comprehensive technical services for the built environment industry, specializing in various design fields and sectors |
421 | |||
| 25 |
ACOR Consultantsacor.com.au
An employee-owned engineering consulting firm providing specialist services in multiple sectors, with a focus on client success and a strong workplace culture |
417 | |||
| 26 |
GHD Designghd.com
GHD Design empowers transformation through innovative design and collaboration, creating a more sustainable and integrated built environment for future generations |
398 | |||
| 27 |
Noviginovigi.com.au
Specializing in data and technology solutions for the financial services industry, we provide expertise to solve complex problems and deliver value reliably |
378 | |||
| 28 |
DXC Red Rockdxc.to
Leader in Oracle consulting and managed services in Australia and New Zealand, offering dynamic technology solutions for businesses globally |
340 | |||
| 29 |
Cognizant Serviancognizant.com
Specializing in cloud and data consulting, merging two expert teams to deliver digital transformation services for leading brands in the ANZ region |
283 | |||
| 30 |
Hall Chadwickhallchadwick.com.au
A leading Australian accounting group providing a wide range of services including auditing, taxation, financial planning, and business recovery support |
278 | |||
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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 Sydney
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- Multinational companies in Sydney 279
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- Financial Services companies in Sydney 143
- Professional services firms in Sydney 93
- Publicly traded companies in Sydney 78
- Retail chains in Sydney 77
- Companies with a mobile app in Sydney 64
- Critical infrastructure operators in Sydney 63
- Investment Management companies in Sydney 60
- Corporate groups and holding companies in Sydney 57
- SaaS companies in Sydney 51
- IT Services and IT Consulting companies in Sydney 49
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- Subscription businesses in Sydney 40
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- Venture capital and private equity firms in Sydney 33
- Real Estate companies in Sydney 32
- Retail companies in Sydney 32
- Software Development companies in Sydney 30
- AI companies in Sydney 28