He also won the honor in 2003 and 2012.
The Spurs have won at least 50 games in 16 of Popovich's 18 seasons at the helm, including the last 15 straight.
Phoenix's Jeff Hornacek was runner-up in the voting and Chicago's Tom Thibodeau finished third.
Popovich led the Spurs to NBA titles in 1999, 2003, 2005 and 2007, and back to the finals last season before losing a heartbreaking Game 7 to the Miami Heat.
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