Tadeusz Rejtan (also in the Old Polish spelling: Tadeusz Reytan) (1742-1780) was a Polish nobleman, a member of confederation of Bar, Member of Sejm for the Nowogród constituency.

In September 1773 Rejtan tried to prevent the legalization of the first partition of Poland by preventing the members of parliament from entering the chamber. The dramatic events are depicted on a 1866 painting by Jan Matejko.

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After the partition eventually had taken place, Rejtan withdrew from the political life and lived until his death in a small estate called Hruszówka. Apparently he was so depressed that he committed suicide by swallowing broken glass.

Tadeusz Rejtan has been remembered thoughout Polish history as a shining example of patriotism. As such, he is also the protagonist of countless works of art, poems, songs and books.