Cahalan is a surname. Notable people with the surname include:
- Adrienne Cahalan (born 1964), Australian sailor
- Cissie Cahalan (1876–1948), Irish suffragette
- Robert Cahalan (born 1946), American atmospheric scientist
- Sinéad Cahalan, Irish camogie player
- Susannah Cahalan (born 1985), American journalist and author
See also
edit- Cahalane, surname