The Altrincham by-election was held on 28 May 1913.
The vacancy occurred following the resignation of John Robert Kebty-Fletcher, the sitting Unionist member of parliament for Altrincham.
Kebty-Fletcher had won the seat from the Liberal Party at the previous general election in December 1910 with a slim majority of 119 votes.
On 2 May, the candidates for the by-election were selected. The Altrincham Unionist Association chose George C Hamilton of Knutsford, while the Liberals nominated Lawrence Kay-Shuttleworth, eldest son of Lord Shuttleworth, Lord-Lieutenant of Lancashire.
The writ for the by-election was moved on 8 May, and the date for the election was set as 28 May. The delay was due to allow for the week-long Whitsun holiday enjoyed by Manchester workers.
The Liberals had formed a minority government with the support of Irish Nationalists. As the price of Nationalist support the government was attempting to introduce Home Rule for Ireland.
One of the main issues in the contest was Home Rule The Irish Nationalist leaders John Redmond and T P O'Connor urged Irish voters to support Kay-Shuttleworth. Hamilton spoke out in support of the Ulster Unionists who were threatening armed insurrection to resist devolution. This led to the Manchester Guardian launching an attack on the Conservative candidate as a "revolutionist". The apparent lack of support for Hamilton by Kebty-Fletcher, and his treatment by the local Unionist Party caused some controversy, although he eventually issued a letter discounting the story.