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J.J. Watt didn't let a little thing like a broken leg keep him from throwing out the first pitch in a HUGE Game 3 of the World Series in Houston ... and obviously -- the crowd loved it!!!

Watt's a hometown hero for raising more than $37 MILLION for Hurricane Harvey relief ... so you gotta think the fans will give him a pass for the pitch to Astros pitcher Dallas Keuchel being juuuuuuust a bit outside.

J.J.'s season with the Texans is over after having a season-ending surgery a few weeks ago ... but clearly he can still have an impact on the baseball field.