Theodorus "Theo" Heemskerk (20 July 1852 – 12 June 1932) was a Dutch Anti-Revolutionary politician who served as Minister of the Interior and chairman of the Council of Ministers (a post later dubbed Prime Minister), from 1908 to 1913. Heemskerk is particularly known as the founder of the Dutch poverty and vaccination laws. His father Jan Heemskerk also served as Prime Minister of the Netherlands.