the following are the list of top engineering consultants ( consulting companies ) in Australia :

1. AECOM engineering (Branch office) is the world’s premier infrastructure Engineering consulting firm, delivering professional services throughout the project lifecycle – from planning, design and engineering to program and construction management .
2. Jacobs Engineering Group (Branch office) is an American international technical professional services firm.  provides technical, professional and construction services.
3. ACOR Consultants Pty Ltd is an employee-owned engineering consulting firm in Australia, offering a full range of specialist engineering services across multiple sectors.
4. Aurecon is a design, engineering and advisory company that brings ideas to life to create a better future for people and the planet.
5. Hatch Ltd is a global multidisciplinary management, engineering and development consultancy.
6. Mott MacDonald Engineering is one of the largest  a consultancy employee-owned companies in the world .
7. Stantec Engineering is an international professional services company in the design and consulting  fields .
8. Wood is a global leader in consulting and engineering across energy and the built environment.
9. 3XN Australia Pty. Ltd ( 3xn Architects ) is one of the leading international Architecture and Planning firm .
10. HDR Architecture is an employee-owned design firm specializing in engineering, architecture, environmental and construction services .
11. Atkins engineering is one of the world’s most respected design, engineering and project management consultancies.