John Costello may refer to:
- John Costello (baseball) (born 1960), American baseball pitcher
- John A. Costello (1891–1976), Taoiseach of Ireland
- John M. Costello (1903–1976), U.S. Representative from California
- John Costello (Medal of Honor recipient) (1850–?), U.S. Navy sailor and Medal of Honor recipient
- John Edmund Costello (investigative author) (b. Newbury, 1943may3-1995aug26) who wrote on spies including Oleg Tsarev and Ursula Kuczynski, and was murdered suspiciously in 1995.
Famous quotes containing the word john:
“We like the idea of childhood but are not always crazy about the kids we know. We like it, that is, when we are imagining our own childhoods. So part of our apparent appreciation of youth is simply envy.”
—C. John Sommerville (20th century)