Catherine or Catharine Baker may refer to:
- Catherine Baker Knoll (1930–2008), lieutenant governor of Pennsylvania
- Catharine Baker (born 1971), American politician formerly serving in the California State Assembly
- Cathy Baker (actress) (born 1947), American actress known for Hee Haw
- Cathy Baker (field hockey) (born 1957), New Zealand field hockey player
- Kate Baker (Catherine Baker, 1861–1953), teacher and literary guardian of Joseph Furphy's works