Charles Mark Jackson (born June 12, 1954) is an American former professional football quarterback who played six seasons in the Canadian Football League (CFL) with the Montreal Alouettes, Toronto Argonauts, and Winnipeg Blue Bombers. After leading Carlsbad High School to an undefeated record as a senior in 1971, he played college football at the University of Texas at El Paso and was the school's first-ever freshman varsity letterman in any sport. He then transferred to play at Baylor University, where he was a two-year starter. At the conclusion of his college career, Jackson led the West team to victory in the East-West Shrine Game.

After going undrafted in the 1977 NFL draft, Jackson signed with the Alouettes. He started two games for the Alouettes during the 1977 season, and then spent the 1978 offseason with the NFL's St. Louis Cardinals. He returned to the CFL in 1979 with the Argonauts, spending his first season as a backup and leading the Eastern Football Conference in passing yards during his second season. Jackson was then traded to the Blue Bombers, where he backed up Dieter Brock from 1981 to 1982. After Brock retired, Jackson started the 1983 season opener but was then released.

Charles Mark Jackson was born on June 12, 1954, in Carlsbad, New Mexico. He played high school football at Carlsbad High School. He led the school to an undefeated season in 1971 and earned all-state honors. Jackson also set the school's single-season and career records for both passing and total offense.

Jackson first played college football for the UTEP Miners of the University of Texas at El Paso as a freshman in 1972. He saw action throughout the 1972 season and started UTEP's final game of the year after senior quarterback Gary Keithley suffered a broken hand. Overall in 1972, Jackson completed 24 of 70 passes (34.3%) for 283 yards, two touchdowns, and two interceptions while also rushing for 33 yards and two touchdowns. He was the first freshman in UTEP history to earn a varsity letter in any sport. He was the first-string quarterback at spring practices in 1973.

In May 1973, Jackson transferred to Baylor University for personal reasons. He had to sit out, and redshirt, the 1973 season due to NCAA transfer rules. He ran the scout team in 1973. As a sophomore in 1974, Jackson was the backup to Neal Jeffrey, completing 10 of 18 passes (55.6%) for 134 yards, one touchdown, and three interceptions while rushing for 129 yards and one touchdown. Jackson took over as starter in 1975. He missed some time after breaking his collarbone in the first game of the season. Overall in 1975, he recorded 70 completions on 151 passing attempts (46.4%) for 1,021 yards, four touchdowns, and nine interceptions while also running for 385 yards and two touchdowns. As a senior in 1976, Jackson completed 105 of 211 passes (49.8%) for 1,132 yards, six touchdowns, and 11 interceptions while rushing for 426 yards and three touchdowns. He led the 1976 Bears to a 7–3–1 record.

Jackson was selected to play in the East-West Shrine Game after his senior year. Jackson was the starter for the West team, completing 13 of 26 passes for 116 yards as the West won 30–14. The East quarterbacks only completed two of 17 passes for a 48-yard touchdown. Jackson had planned to split time with Joe Roth during the game but Roth pulled a back muscle prior to the contest. Roth died of cancer a month later.

After going undrafted in the 1977 NFL draft, Jackson signed a two-year contract with the Montreal Alouettes of the Canadian Football League (CFL) on May 16, 1977. After Sonny Wade and Joe Barnes both suffered injuries, Jackson temporarily took over as starter for two games in October 1977. Jackson was waived by the Alouettes before the start of the playoffs to meet the 39-player postseason roster limit. He dressed in eight games overall during the 1977 season, totaling 33 completions on 76 passing attempts (43.4%) for 361 yards, two touchdowns, and three interceptions, and 38 rushing attempts for 134 yards and one touchdown.

Jackson signed with the St. Louis Cardinals of the National Football League on May 15, 1978. He was cut by the Cardinals on August 23, 1978. After Cardinals quarterback Jim Hart suffered an injury in October 1978, head coach Bud Wilkinson tried to re-sign Jackson. However, Wilkinson was informed that, once the trade deadline had passed, no team could sign a player who had been on the roster previously. The trade deadline had passed eight days earlier, so the Cardinals signed Mark Manges instead.