Joseph Casey Cox (July 3, 1941 – October 2, 2023) was an American professional baseball player who pitched in the Major Leagues between 1966 and 1973 for the Washington Senators/Texas Rangers and New York Yankees.

Cox entered baseball in 1962 as a member of the Cincinnati Reds' organization, then was drafted in successive years by the Cleveland Indians (1963) and Senators (1964).

But he won only eight of 20 decisions and his ERA climbed to 4.45, as Washington faltered and finished last in the American League East.

In 1971 he returned to the Senator bullpen and tied his career-best with seven saves, but Washington struggled again on the field and at the turnstiles, and the franchise was moved to Dallas–Fort Worth as the Texas Rangers during the offseason.

Over the course of Cox' MLB career, he posted a 39–42 won–lost record, 20 saves, five complete games, and an earned run average of 3.70.