Barclay Mowlem was an Australian construction company that traded from 1957 until 2006.

In 1958 it expanded into Papua New Guinea when it was awarded a contract to build a new hospital in Madang.

It expanded into all other Australian mainland states except South Australia and into Asia.

[4] With no other Australian operations, Carillion put the business up for sale, with Laing O'Rourke purchasing it in July 2006 and retiring the brand.

[5][6] Notable projects completed by Barclay Mowlem included: At the time of its sale to Laing O'Rourke, Barclay Mowlem was involved in the construction of the Chatswood Transport Interchange and Fortescue railway.