Tadeusz Reytan (or Tadeusz Rejtan, rarely Reyten; 20 August 1742 – 8 August 1780) was a Polish-Lithuanian nobleman. He was a member of the Polish Sejm from the constituency of Nowogródek (today Navahrudak, Belarus). Rejtan is remembered for a dramatic gesture he made in September 1773, as a deputy of the Partition Sejm. There, Rejtan tried to prevent the legalization of the first partition of Poland, a scene that has been immortalized in the painting Rejtan by Jan Matejko. He has been the subject of many other art works, and is a symbol of patriotism in Poland. Despite his efforts, the partition of Poland was legalized soon afterwards.