Reggie Jackson (born May 18, 1946) was a professional American baseball player from 1967 to 1987. He was inducted into the United States Baseball Hall of Fame in 1993 in recognition of his talents.

Born Reginald Martinez Jackson on May 18, 1946 in Wyncote, Pennsylvania, he earned the nickname "Mr. October" due to his outstanding overall performances in the 5 World Series that he appeared in. In 27 World Series games, he amassed 10 home runs, including four in a row (three of them on consecutive pitches), 24 RBI and a .357 batting average.

Jackson's other accomplishments include winning the 1973 regular-season MVP award, amassing a total of 563 career homeruns, maintaining a .490 career slugging percentage, and the dubious distinction of being the all-time leader in striking out with 2597. Jackson played with the Oakland Athletics, Baltimore Orioles, New York Yankees, and, in the twilight of his career, the California Angels.

The now-discontinued "Reggie Bar" candy bar was named after the ballplayer.

His jersey number, 44, is retired by the Yankees. In 2004, the A's will retire the number 9 that he wore during his days in Oakland. He is the only non-pitcher to win World Series most valuable player honors twice (in 1973 with the Oakland A's and in 1977 with the New York Yankees).