William Keith McDonald (born February 8, 1973) is a former Major League Baseball catcher and right-handed batter.

He attended Esperanza High School in Anaheim, California.

On July 4, 2000 McDonald became the third player in St. Louis history to hit a home run in his first major league at-bat.

On July 6, he homered in his second at-bat, becoming only the second player in MLB history to hit home runs in each of his first two big league at bats.

[1][2] In his first season McDonald batted .429 (3-7), with three homers, five RBI and three runs in six games.