Reginald Martinez "Reggie" Jackson (born May 18, 1946), nicknamed "Mr. October" for his clutch hitting in the postseason, is an American former Major League Baseball right fielder who played for five different teams from 1967 to 1987. He won three consecutive World Series titles as a member of the Oakland A's in the early 1970s and also won two consecutive titles with the New York Yankees. He was inducted into the Hall of Fame in 1993. When he retired, he was sixth in home runs. He currently resides in Carmel, California.

Reggie Jackson was born in Wyncote, Pennsylvania, just north of Philadelphia, the son of former Negro Leagues player Reginald Martinez Jackson an Puerto Rican, and later hailing from Oakland, California, Clara Martinez, Jackson's paternal grandmother was born in St. Croix to Puerto Rican parents. In Jackson's family, Martinez was a "personal" name and not a last name.

Jackson graduated from Cheltenham High School in 1964, where he had excelled in both football and baseball. Jackson attended Arizona State University on a football scholarship. There, he met Jannie Campos, his first wife, a Mexican-American. He switched to baseball following his freshman year, impressing coach Bobby Winkles with his great baseball skill.