Cardinals created by Gregory XV
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Pope Gregory XV (r. 1621–1623) created eleven cardinals in four consistories:
- Ludovico Ludovisi, nephew of the Pope – cardinal-priest of S. Maria in Traspontina (received the title on 17 March 1621), then cardinal-priest of S. Lorenzo in Damaso (7 June 1623), † 18 November 1632
19 April 1621

All the new cardinals received titular churches on 17 May 1621.
- Antonio Caetani, archbishop of Capua – cardinal-priest of S. Pudenziana, † 17 March 1624
- Francesco Sacrati, titular archbishop of Damasco – cardinal-priest of S. Matteo in Merulana, † 6 September 1623
- Francesco Boncompagni, grandson of Gregory XIII – cardinal-deacon of S. Angelo in Pescheria, then cardinal-deacon of S. Eustachio (16 March 1626), cardinal-priest of SS. IV Coronati (6 February 1634), † 9 December 1641
- Ippolito Aldobrandini, grand-nephew of Clement VIII – cardinal-deacon of S. Maria Nuova, then cardinal-deacon of S. Angelo in Pescheria (16 March 1626), cardinal-deacon of S. Eustachio (6 February 1634), † 19 July 1638
