Martinus Theunis Steyn was a South African lawyer, politician, and statesman. He was the sixth and last president of the independent Orange Free State from 1896 to 1902.

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.