John Crawfurd Platt (11 May 1894 - 23 January 1974) was an estate agent and local politician in the Hammersmith area. He inherited an estate agent's and auctioneer's business based in Hammersmith Broadway from his father, also John Crawfurd Platt (1865-1940). From 1925-31 he was a member of the London County Council as a Municipal Reform Party councillor representing Hammersmith South.