Smithfield (known for part of its history as Smithfield-Rouxville) was a constituency in the Orange Free State Province of South Africa, which existed from 1910 to 1994.

When the Union of South Africa was formed in 1910, the electoral qualifications in use in each pre-existing colony were kept in place.

The franchise was also restricted by property and education qualifications until the 1933 general election, following the passage of the Women's Enfranchisement Act, 1930 and the Franchise Laws Amendment Act, 1931.

Non-whites remained disenfranchised until the end of apartheid and the introduction of universal suffrage in 1994.

[1] Smithfield, like most of the Orange Free State, was a highly conservative seat throughout its existence and had a largely Afrikaans-speaking electorate.