The 1921 South African general election was held for the 134 seats in the House of Assembly of the Union of South Africa, on 8 February 1921. The South African Party, which since the previous election had fused with the Unionist Party, won an absolute majority.
The South Africa Act 1909 had provided for a delimitation commission to define the boundaries for each electoral division. The representation by province, under the third delimitation report of 1919, is set out in the table below. The figures in brackets are the number of electoral divisions in the previous (1913) delimitation. If there is no figure in brackets then the number was unchanged.
The electoral divisions used for this general election were the same as those for the 1920 election.
The vote totals in the table below may not give a complete picture of the balance of political opinion, because of unopposed elections (where no votes were cast) and because contested seats may not have been fought by a candidate from all major parties.
The total registered electorate was 499,531. The votes cast were 277,742 (no figure for spoilt votes at this election is available).