Costelloe may refer to:
- Casla, English name Costelloe, a village in western County Galway, Ireland
People
edit- John Costelloe (politician) (born c. 1900), Irish politician, member of Seanad Éireann from 1963 to 1965
- John Costelloe (actor) (1961–2008), American actor
- Noel Costelloe (fl. 2011), Irish hurling player
- Paul Costelloe (born 1945), Irish fashion designer
- Timothy Costelloe (been 1954), Australian metropolitan bishop