Thomas Costello
Thomas or Tom Costello may refer to:
- Tom Costello (music hall), British music hall comedian and singer
- Tom Costello (jockey), American jockey
- Thomas W. Costello, politician from Vermont in the United States
- Thomas Costello (hurler), Irish hurler from Tipperary
- Tom Costello (politician), Irish Labour Party politician, mayor of Galway, 2007–2008
- Tom Costello, CEO and founder of Cuil
- Tom Costello (journalist), NBC News journalist
- Thomas Moore Costello, lawyer, judge and political figure in Ontario
- Thomas Joseph Costello, American prelate of the Catholic Church
- Thomas Costello (bishop), Irish bishop