Jack E. Hiatt (born July 27, 1942) is an American former professional baseball player and minor league manager.

He played in Major League Baseball as a catcher from 1964 to 1972, most prominently as a member of the San Francisco Giants.

Hiatt graduated from San Fernando High School and then attended Los Angeles Pierce College.

[1] At the beginning of the 1969 San Francisco Giants season, the starting catcher job was won by Dick Dietz.

"[3] On April 24, Hiatt hit his first home run of the season off Atlanta Braves pitcher Milt Pappas, an opposite field 360-foot shot that also drove in Willie McCovey.

In the first inning, Hiatt homered off Astros starter Denny Lemaster to drive in teammate Willie Mays.

In the bottom of the 13th inning, Hiatt dramatically hit a walk-off grand slam off Astros pitcher Dan Schneider to end the game.