Hyder Consulting

Hyder Consulting plc

Number of employees	4,200
Parent	Arcadis NV
Website	Hyder Consulting

Hyder Consulting was a multi-national advisory and design consultancy with particular specialisation in the transport, property, utilities and environmental sectors. The firm employs approximately 4,200 people across the UK, Europe, Germany, Middle East, Asia and Australia and has been listed on the London Stock Exchange since October 2002. The name Hyder is the Welsh word for "confidence".

As of October 2014 Hyder Consulting is part of Arcadis NV.

The firm was responsible for the design of projects such as the Victoria Falls Bridge (1905), the Sydney Harbour Bridge (1932), the Otto Beit Bridge (1939) the Forth Road Bridge (1964), the Severn Bridge (1966), the Bosphorus Bridge (1973), the Humber Bridge (1981), and the Fatih Sultan Mehmet Bridge (1988). Other notable projects included the Parkes radio telescope (1961), the Erskine Bridge, the 46m Algonquin Radio Observatory (1965), and Melbourne's West Gate Bridge (1978).

The eminent consulting engineering practices that went on to form Hyder Consulting were John Taylor and Sons with origins from 1739, Freeman Fox and Partners, founded in 1857, and Sir Bruce White Wolfe Barry and Partners with origins from 1856. The first two long-established practices merged due to common interests in 1987 becoming the Acer Group, with Sir Bruce White Wolfe Barry and Partners joining the Group in 1991. Over the next few years, several smaller specialist firms were incorporated to form a worldwide infrastructure and civil engineering consultancy.

The company and another consultant Wallace Evans Ltd were acquired by Welsh Water in 1993 and renamed Hyder Consulting in 1996. When Hyder Consulting was bought by Western Power Distribution, the senior management of Hyder Consulting instigated a management buy-out, completed in January 2001. The firm then listed on the in October 2002.