The 1948 Brigg by-election was a by-election held on 24 March 1948 for the British House of Commons constituency of Brigg in Lincolnshire. The by-election was triggered by the resignation of the constituency's Labour Party Member of Parliament (MP) Tom Williamson, a trade union leader who had held the seat since the 1945 general election. The result was a victory for the Labour candidate Lance Mallalieu, who held the seat with a reduced majority, and represented Brigg until he retired from the House of Commons in 1974.

Result and votes