Prince Antoni Stanisław Czetwertyński-Światopełk (1748[1]–1794[2]) was a nobleman (szlachcic) and politician in the Polish–Lithuanian Commonwealth.

He was a member of the commission negotiation the First Partition of Poland, an opponent of the Constitution of 3 May and a participant of the Confederation of Targowica.

On 28 June 1794, an angry mob stormed the prison, and he was hanged together with other people declared traitors, like bishop Ignacy Jakub Massalski.

His family was smuggled to St. Petersburg, where his daughter Marie became a mistress of Alexander I of Russia.

Światopełk is one of the figures immortalized in Jan Matejko's 1891 painting, Constitution of 3 May 1791.