Colin Wells Eglin (14 April 1925 – 29 November 2013) was a South African politician best known for having served as national leader of the opposition from 1977–79 and 1986–87. He represented Sea Point in the South African Parliament from 1958–61 and from 1974–2004. Described by Nelson Mandela as "one of the architects of (South Africa's) democracy", Eglin played a leading role in the drafting of the country's post-apartheid constitution.