Sir Harold John Boyer Harding (6 January 1900 – 27 March 1986) was a British civil engineer. Harding was educated at Christ's Hospital and the City and Guilds College (part of Imperial College London), interrupting his studies 1918-19 with a one-year period spent as a cadet in the Officers' Training Corps. Following graduation Harding worked for Mowlem where he specialised in tunnelling work for London Underground including the reconstruction of Piccadilly Circus tube station and the expansion of the Central line. In the 1930s he and Mowlem were instrumental in introducing geotechnical processes to the UK.