Balfour Beatty plc (LSE: BBY) is a British construction, engineering, military housing, rail and investment services company. It is one of the largest construction companies in the UK, and the 15th largest in the world. It is a constituent of the FTSE 250 Index.

Balfour Beatty works for customers principally in the UK, the US, South-East Asia, Australia and the Middle East.

Balfour Beatty was formed in 1909 with a capital of £50,000 – an exceptionally large sum for the time. The two principals were George Balfour, a qualified mechanical and electrical engineer, and Andrew Beatty, an accountant, who had met while working for the London branch of the New York engineers JG White & Company. Initially the Company concentrated on tramways, the first contract being for the Fife Tramway Light and Power Company at Dunfermline; its general construction expertise was extended during World War I with, for example, army camps.

George Balfour was elected to the House of Commons in 1918 and played a large part in the debates which established the National Grid. To service this new market, George Balfour, Andrew Beatty and others formed Power Securities to finance projects and the two companies, with their common directors, worked closely together. Balfour Beatty was heavily involved in the development of Scotland’s hydro-electric power, building dams, transmission lines and power stations. Other work between the wars included the standardisation of the electricity supply in Derbyshire and Nottinghamshire, and the construction of tunnels and escalators for the London Underground. Extensive overseas work started in 1924 when Balfour Beatty took over the management of the East African Power & Lighting company; construction work included hydro-electric schemes in the Dolomites, Malaya and India; power stations in Argentina and Uruguay and the Kut Barrage on the Tigris in Iraq.