Dennis Dale "Denny" McLain (born 29 March 1944) is an American former professional baseball player. He played as a pitcher in Major League Baseball for ten seasons, most notably for the Detroit Tigers. In 1968, McLain became the last pitcher in Major League Baseball to win 30 or more games during a season (31–6)— a feat accomplished by only thirteen players in the 20th century.
McLain was brash and outspoken, sometimes creating controversy by criticizing teammates and fans with little provocation. His stellar performance at the beginning of his professional baseball career was a marked contrast to his personal life, where he became associated with organized crime and was eventually convicted on charges of embezzlement and served time in prison.