Katzen is a surname of German origin, which means "cats". It may refer to:
- Daniel Katzen (born 1952), French horn player and teacher
- Jay K. Katzen (1936–2020), American diplomat
- Lila Katzen (1925–1998), American sculptor
- Mollie Katzen (born 1950), American chef and writer
- Sally Katzen (born 1942), American legal scholar
- Katzen (performer)