Ryan William Cook (born June 30, 1987), nicknamed "Cookie",[1] is an American former professional baseball pitcher.

[5] On December 9, 2011, the Diamondbacks traded Cook, along with Jarrod Parker and Collin Cowgill, to the Oakland Athletics for Trevor Cahill and Craig Breslow.

[6] On April 27, 2012, against the Baltimore Orioles, Cook became the 61st player in MLB history to record four strikeouts in one inning.

Cook began the 2018 season with the Triple–A Tacoma Rainiers and impressed with a 2.03 ERA and 17 strikeouts in 13+1⁄3 innings pitched.

On December 29, 2018, Cook signed with the Yomiuri Giants of Nippon Professional Baseball (NPB).