The 1946 Rotherhithe by-election was held on 19 November 1946.
The by-election was held after the incumbent Labour MP, Sir Benjamin Smith became the chairman of the West Midlands Coal Board.
It was won by the Labour candidate Bob Mellish.
[1] London County Councillor Edward Martell beat the Conservative candidate, the future Gillingham MP Frederick Burden, into third place, polling more than one-quarter of the vote.
This article about a by-election to the Parliament of the United Kingdom in London is a stub.