Reginald Martinez "Reggie" Jackson (born May 18, 1946), nicknamed "Mr. October" for his clutch hitting in the postseason, is a former American Major League Baseball right fielder. During a 21-year baseball career, he played from 1967-1987 for four different teams. Jackson currently serves as a special advisor to the New York Yankees. He helped win three consecutive World Series titles as a member of the Oakland A's in the early 1970s and also helped win two consecutive titles with the New York Yankees. Jackson was inducted into the Hall of Fame in 1993. He now resides in Las Vegas, Nevada.

Jackson was born in Wyncote, Pennsylvania, just north of Philadelphia. His father was Martinez Jackson, a tailor who was also a former second baseman with the Newark Eagles of the Negro Leagues. He was the youngest of four children between Reggie's mother, Clara, who was of Hispanic descent. He also had two half siblings from his father's first marriage. His parents divorced when he was four; his mother taking four of his siblings with her, while his father was left with Jackson, and one of the siblings from his first marriage, though one sibling later returned to Wyncote. His father raised his son as a single parent, and was one of the few black families in Wyncote. He didn't experience the Jim Crow laws that most African-American ballplayers from his era experienced as Wyncote was primarily a Jewish town. He was able to develop a social ease with the Jewish community in Wyncote, as all his friends, girlfriends, coaches, and teachers during that timeframe were Jewish. (in 1972, Jackson joined his Jewish teammates on the A's, Ken Holtzman and Mike Epstein, in wearing black armbands for the rest of the postseason after the Munich Massacre).

Jackson graduated from Cheltenham High School in 1964, where he excelled in football, basketball, baseball and track and field. In his junior year of high-school, Jackson, a tailback tore up his knee in a early season game. He was told by the doctors he was never to play football again, but Jackson returned for the final game of the season. In that game, Jackson fractured five cervical vertebrae, which caused him to spend six weeks in the hospital, and another month in a neck cast. Doctors told Jackson that he might never walk again, let alone play football, but Jackson defied the odds again. On the baseball team, he batted .550 and threw several no-hitters. In the middle of his senior year, Jackson's father was arrested for bootlegging and was sentenced to six months in jail.