Losberg was a constituency in the Transvaal Province of South Africa, which existed from 1910 to 1994.

Throughout its existence it elected one member to the House of Assembly and one to the Transvaal Provincial Council.

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

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

It was notably represented early in its history by Louis Botha, who was Prime Minister between 1910 and 1919.