The Orange River Colony was the British colony created after Britain first occupied (1900) and then annexed (1902) the independent Orange Free State in the Second Boer War. The colony ceased to exist in 1910, when it was absorbed into the Union of South Africa as the Orange Free State Province.

The Orange Free State was an independent Boer sovereign republic under British suzerainty in Southern Africa during the second half of the 19th century, which ceased to exist after it was defeated and surrendered to the British Empire at the end of the Second Boer War in 1902. It is one of the three historical precursors to the present-day Free State province.