Sir William O'Brien (born 25 January 1929) is a former Labour Party politician in the United Kingdom.

[1][2] Born in the historic market town of Pontefract, West Riding of Yorkshire, O'Brien was previously a miner from 1946 to 1983 and local councillor on Wakefield Council from 1973 to 1983.

[3] He stood unsuccessfully for the post of Secretary for the Yorkshire region of the National Union of Mineworkers in 1973, losing to Owen Briscoe from the Yorkshire Left group.

[3] He was named a Knight Bachelor in the 2010 Dissolution Honours.

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