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:
“Pervading nationalism imposes its dominion on man today in many different forms and with an aggressiveness that spares no one.... The challenge that is already with us is the temptation to accept as true freedom what in reality is only a new form of slavery.”
—Pope John Paul II (b. 1920)