Arup (officially Arup Group Limited) is an independent firm of designers, engineers, architects, planners, consultants and technical specialists working across every aspect of today’s built environment. It is headquartered in London, England.

It was founded by Sir Ove Arup (16 April 1895 – 5 February 1988) in 1946. Arup was born in England from a Danish father and a Norwegian mother. In 1913, he began studying philosophy at University of Copenhagen and in 1918 enrolled for an engineering degree at the Technical University of Denmark, Copenhagen, specializing in reinforced concrete. He completed his studies in 1922.

In 1946 he founded his own office, Arup and Partners, with Ronald Jenkins, Geoffrey Wood and Andrew Young. A further company, Arup Associates, was formed in 1963 as a new partnership, a body of Architects and Engineers working on an equal basis as Building Designers: the engineer Ove Arup, the architects Francis Pym and Philip Dowson, and the former partners of Arup and Partners.

The firm now has over 16000 staff based in 96 offices across 35 countries around the world. Arup has participated in projects in over 160 countries, standing out the Sydney Opera House, which launched Arup into the premier league of engineering consultancies.