Callahan
- Archon
- Callaghan (disambiguation)
- Callahan (surname)
- Callahan County, Texas
- Callahan Creek
- Callahan State Park
- Callahan Tunnel
- Callahan's Crosstime Saloon
- Callahan, California
- Callahan, Florida
- Callihan
- Father Callahan
- Foxhole (video game)
- Harry Callahan (character)
- Henry Callahan
- Jack Callahan (Neighbours)
- Legally Blonde
- Mercy (TV series)
- Nancy Callahan
- Orlando, Florida
- Stranger Things
- Tag (2018 film)
- The Bionic Woman
- Tommy Boy (film)
- Ultimate (sport)