Richard Ray Grapenthin (born April 16, 1958) is an American former professional baseball player, a right-handed pitcher who appeared in 19 Major League games, 18 in relief, for the Montreal Expos for parts of three seasons between 1983 and 1985.

He progressed through the Montreal system — posting a microscopic 0.80 earned run average in 45 innings pitched for the Class A San Jose Expos of the California League in 1982.

Starting pitcher Scott Sanderson retired the Atlanta Braves in order in the top of the first inning, but on the third out, he was spiked in the pitching hand by Claudell Washington and was forced to leave the game.

[1][2] Grapenthin relieved Sanderson in the second, and kept Atlanta off the scoreboard for his first two innings; but in his third frame, he allowed a three-run home run to Bob Horner and a solo shot to Chris Chambliss, and was tagged with the eventual 5–2 loss.

He later played at Triple-A for the San Diego Padres, St. Louis Cardinals, Detroit Tigers and New York Yankees organizations, and concluded his minor league career in 1989 after ten professional seasons.