Sidney Greene, Baron Greene of Harrow Weald

Sidney Francis Greene, Baron Greene of Harrow Weald, CBE (12 February 1910 – 26 July 2004) was a trade union leader in the United Kingdom, serving as general secretary of the National Union of Railwaymen from 1957 to 1975. He promoted close ties between the union and the Labour Party, which have not persisted with its successor National Union of Rail, Maritime and Transport Workers.

Appointed a Commander of the Order of the British Empire in the 1966 New Year's Honours, he was Knighted in 1970. On 21 January 1975 he was created a life peer as Baron Greene of Harrow Weald, of Harrow in the County of Greater London.

Early in his career, after leaving school at age 14, Greene was a porter at Paddington station.