John Martin Costello (January 15, 1903 – August 28, 1976) was an American lawyer and politician who served five terms as a U.S. Representative from California from 1935 to 1945.

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John Costello
Member of the U.S. House of Representatives from California's 15th district
In office January 3, 1935 – January 3, 1945
Preceded by	William I. Traeger
Succeeded by	Gordon L. McDonough
Personal details
Born	John Martin Costello (1903-01-15)January 15, 1903 Los Angeles, California, United States
Died	August 28, 1976(1976-08-28) (aged 73) Las Vegas, Nevada, United States
Resting place	Calvary Cemetery, Los Angeles, California
Political party	Democratic
Education	Loyola College of Los Angeles

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Born in Los Angeles, California, the son of Irish immigrants,^[1] Costello attended the public schools. He was graduated from Loyola Law School, Los Angeles, California, in 1924. He was admitted to the bar the same year and commenced practice in Los Angeles. He was a teacher in Los Angeles secondary schools in 1924 and 1925.

He was an unsuccessful candidate for election to the Seventy-third Congress in 1932.

He served as general counsel and manager of the Washington office of the Los Angeles Chamber of Commerce from 1945 to 1947. He engaged in the practice of law in Washington, D.C. from 1947 to 1976.

He died in Las Vegas, Nevada, August 28, 1976. He was interred in Calvary Cemetery, Los Angeles, California.

• List of members of the House Un-American Activities Committee