Derek Williams (20 August 1929 – 2 August 2021) was a British documentary film director and writer who was active from the 1950s until 1990. His films received four British Academy of Film and Television Arts (BAFTAs) and five Oscar nominations (four as director and writer and one as writer only) all in the short documentary classification.

Born in Newcastle upon Tyne, he was educated at Newcastle Royal Grammar School and Corpus Christi College, Cambridge.

His first film, Hadrian's Wall, was made while he was at university and was self-financed. On the basis of this film he was able to enter the film industry as a trainee assistant for World Wide Films. His first commercial film, released in 1955, was Oil Harbour, Aden, made for the sponsor George Wimpey & Co who had the contract to build a port to service a nearby oil refinery being built by BP. Williams acted as cameraman as well as writer and director during the two year location filming.

His first big break came in 1955 when World Wide Films was appointed by BP to film the British Trans-Antarctic Expedition, under Dr Vivian Fuchs, which BP was sponsoring. Williams became a member of the sixteen-person party the sailed to the Weddell Sea aboard Theron with the intention of establishing an advance base for the main party due to arrive the following year. During the outward journey the ship became frozen is sea ice and also had to depart more rapidly than originally intended, having deposited the shore party who were to stay through the Antarctic winter. The resulting film, Foothold on Antarctica, was released in 1956. It received a private viewing at Buckingham Palace and went on to receive an Oscar nomination. The film was also shown on a number of occasions as part of public events which included a talk from Sir Vivian Fuchs and which raised private donations towards the costs of the expedition.