Oscar Marion Graham (July 20, 1878 – October 15, 1931) was a professional baseball pitcher.

Graham then went to the Pacific Coast League's Oakland Oaks, and he put up some big numbers in the long PCL seasons.

[5] Graham was also a good hitter, as he had a batting average of .323 to finish sixth in the league in that category.

[1] Graham made his major league debut with the Senators on April 16, 1907.

His last MLB game was on August 5, and he then finished the season with the American Association's Minneapolis Millers.

[3][9] Graham returned to the American Association in 1909, this time with the Indianapolis Indians.

[1][3] Graham lived in Rising Sun, Iowa, in the winters, and he worked as a corn husker and rabbit hunter during that time.