Antipope Gregory XVII may refer to:
- Clemente Domínguez y Gómez (1946–2005), self-proclaimed pope, leader of the Palmarian Catholic Church
- Jean-Gaston Tremblay (1928–2011), self-proclaimed pope, leader of the Apostles of Infinite Love
See also
- Papal election of Giuseppe Siri theory, the claim that Cardinal Giuseppe Siri was elected pope in 1958, with the name Gregory XVII
- Earthly Powers, a novel by Anthony Burgess that includes a character named Pope Gregory XVII
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