Thomas or Tom Costello may refer to:
Tom Costello (music hall) (1863–1943), British music hall comedian and singer Tom Costello (jockey) (1866–?), American jockey Thomas W. Costello (born 1945), politician from Vermont in the United States Thomas Costello (hurler) (born 1978), 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) (born 1963), NBC News journalist Thomas Moore Costello (1883–1954), lawyer, judge and political figure in Ontario Thomas Joseph Costello (1929–2019), American prelate of the Catholic Church Thomas Costello (bishop), Irish bishop
See also Tom Costelloe (disambiguation)