The Louth by-election, 1921 was a by-election held on 22 September 1921 for the British House of Commons constituency of Louth in Lincolnshire.
The seat had become vacant on the death on 8 August of the Liberal Member of Parliament (MP) Thomas Wintringham. He had been elected at the by-election in 1920.
The result at the last election was;
Polling Day was set for 22 September 1921, 45 days after the death of the former MP, allowing for a long campaign. Despite rumours the contrary, on 13 September nominations closed to confirm that the election would be a three-way contest.
Hutchings received the official endorsement of the Coalition Government.
Wintringham held the seat that her husband had gained for the Liberals in a by-election the year before.
Wintringham become only the second woman to take her seat in the House of Commons, and the first female Liberal MP.
Wintringham was re-elected at the 1922 general election,