Costelloe may refer to:
Casla, English name Costelloe, a village in western County Galway, Ireland
People Dara Costelloe (born 2002), Irish footballer John Costelloe (politician) (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 (1945–2025), Irish fashion designer and artist Timothy Costelloe (been 1954), Australian metropolitan bishop Timothy M. Costelloe (born 1964), American philosopher
See also Costello (disambiguation) Costello (surname)