Eugene Hamlet Krapp (May 12, 1887 – April 13, 1923) was a pitcher in Major League Baseball from 1911 to 1915.

In a four season career where he pitched in 118 games, Krapp had a win–loss record of 40-47 and a 3.23 earned run average.

[2] He started his professional baseball career in 1906, in the Southern Michigan League.

Nicknamed "Rubber Arm" for his durability, he pitched 442 innings and went 29–16, as Portland won the pennant.

Krapp led the American League with 138 walks in 1911 but was also difficult to hit, and he went 13–9.