Otto Charles "Pep" Deininger (October 10, 1877 – September 25, 1950) was a German center fielder in Major League Baseball who played for two different teams between 1902 and 1909.

[1] Deininger started his major league career in 1902 as a pitcher for the Boston Americans.

He posted a 9.75 earned run average with two strikeouts and nine walks in two appearances, including one start, and did not have a decision.

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