John Costello
# John Costello

John Costello may refer to:

* John Costello (baseball) (born 1960), American baseball pitcher
* John Costello (English footballer) (1890–1915), English footballer
* John Costello (historian) (1943–1995), British military historian
* John A. Costello (1891–1976), Taoiseach of Ireland
* John M. Costello (1903–1976), U.S. Representative from California
* John Costello (Medal of Honor) (1850–?), U.S. Navy sailor and Medal of Honor recipient
* John Costello (pastoralist) (1838–1923), Australian pastoralist
* John W. Costello (born 1927), American attorney and politician in Massachusetts
* John Costello (Gaelic footballer), Gaelic football player from County Laois
* John P. Costello (1947–2010), U.S. Army general
