Robert George Deer (born September 29, 1960) is an American former professional baseball outfielder.

As a pinch hitter facing Ted Power in the ninth inning, he flied out to end the game.

On December 18, he was traded to the Milwaukee Brewers for two minor league prospects (Dean Freeland and Eric Plinkington).

On Easter Sunday,[4] he hit a game-tying home run, helping the Milwaukee Brewers earn their 12th straight win to start the season.

Deer's final major league appearance was in the bottom of the eighth inning of a Padres-Cardinals game on August 5, 1996, replacing Greg Vaughn in left field.

[10] Deer has gained notoriety in sabermetrics circles due to his propensity for the Three True Outcomes (defined as a strikeout, home run, or base on balls).

[11] Because of Deer's ability to hit for power (eight straight seasons of 21 or more homers) and draw walks, he remained a productive player despite his low batting average and high strikeout totals, as evidenced by his career 13.7 Wins Above Replacement.