Tonkin + Taylor is an employee-owned environmental and engineering consultancy company.

Its head office is in Auckland,[1] New Zealand with offices in Australia, Malaysia and the wider Asia Pacific region.

[2] Services cover civil, environmental, geotechnical and water resources engineering.

In 1959, Ralph Tonkin established a laboratory testing and engineering consulting company Geotechnics Ltd, with technical input from Professor Peter Taylor of University of Auckland.

[2] The partnership was active in many engineering projects in New Zealand and Asia, and founded an office in Malaysia in the 1970s.