Sinclair Knight Merz Pty Limited is an incorporated company which supplies consulting engineering servcies. It commenced in February 1994 when Sinclair Knight and Partners (known as Sinclair Knight) merged with Merz Australia Pty Limited.

Sinclair Knight had commenced as a partnership in 1963, incorporated in 1972 and later merged with a number of Australian and international companies. Merz had commmenced in Australia as a branch of Merz and mc Lelland, a United Kingdom firm of consulting engineers, in 1954. Merz Australia incorporated in 1988, still as part of Merz and McLelland.

Sinclair Knight Merz was one of the companies which purchased aspects of VA 4234 Rural Water Corporation's engineering consultancy arm, the Hydro Technology Division, when the Corporation was broken up in 1995. Under the terms of the sale agreement, the purchasers were entitled to take custody of relevant Rural Corporation Records pending completion of the relevant projects. On completion of the projects the records were to be returned to public custody. By August 2001 Sinclair Knight Merz had transferred several consignments of records to Public Record Office Victoria and at least one consignment to VA 3757 Goulburn-Murray Rural Water Authority. It is possible that Sinclair Knight Merz has retained other public records.

Sinclair Knight Merz's Australian Company Number is 001 024 095.