John Mendelson

John Jakob Mendelson (July 1917 – 20 May 1978), known as Jack Mendelson, was a British Labour Party politician.

Mendelson was educated at the London School of Economics and became a university lecturer in political science. He was vice-president of Sheffield Trades and Labour Council.

Mendelson was the Member of Parliament for Penistone, South Yorkshire from a 1959 by-election until his death, and served on the Public Accounts Committee. It was Mendelson who introduced Tony Benn to the radical history of the Diggers and the Levellers, on which Benn drew from the 1970s onwards.

Mendelson's successor at the subsequent by-election was Allen McKay.