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Harold Norbert Kalas (March 26, 1936 – April 13, 2009) was an American sportscaster, best known for his Ford C. Frick Award-winning role as lead play-by-play announcer for Major League Baseball's Philadelphia Phillies, a position he held from 1971 until his death in 2009.

Kalas was also closely identified with the National Football League, serving as a voice-over narrator for NFL Films productions (a regular feature on Inside the NFL) and calling football games nationally for Westwood One radio.

Kalas collapsed in the Washington Nationals' broadcast booth on April 13, 2009, about an hour before a Phillies game was scheduled to begin against the Nationals, and died soon afterward.