Lamar Demeatrice Jackson Jr. (born January 7, 1997) is an American professional football quarterback for the Baltimore Ravens of the National Football League (NFL). He played college football for the Louisville Cardinals, winning the Heisman Trophy in 2016, and was selected by the Ravens with the final pick in the first round of the 2018 NFL draft. A two-time recipient of the NFL Most Valuable Player (MVP) award and the all-time leader in quarterback rushing yards, Jackson is regarded as one of the best quarterbacks of his generation, and by some analysts as the greatest dual-threat quarterback of all time.

Jackson became the Ravens' starting quarterback during his rookie season after an injury to Joe Flacco, leading the team to a division title and becoming the youngest quarterback to start a playoff game at 21. In his first full season, he led the NFL in touchdown passes and set the single-season rushing record for a quarterback, earning unanimous NFL MVP honors and becoming the fourth Black quarterback to win the award. In 2020, he became the first quarterback with multiple 1,000-yard rushing seasons and led the Ravens to a third straight playoff appearance. He secured a second MVP award in 2023 while taking the Ravens to their first AFC Championship Game since 2012. Jackson currently ranks first on the NFL's all-time regular-season career passer rating list. In 2024, Jackson set career highs in passing, became the all-time leader in quarterback rushing yards, and tied the record for most perfect passer rating games with four.

Lamar Demeatrice Jackson Jr. was born to Felicia Jones and Lamar Jackson Sr. on January 7, 1997. He grew up in the center of an economically distressed section of Pompano Beach, Florida. Jackson's father died from a heart attack on the same day his grandmother died in 2005, when he was eight years old. Jackson, his younger brother, and two younger sisters were raised by their mother. According to Jackson, it was his mom that encouraged him to play football and was his first coach. Jackson says that at the age of 7 she put him and his brother through some very demanding workouts.

Jackson attended public schools and played Pop Warner football in the same Florida league with future teammate Marquise Brown. When he was eight years old, Jackson could throw a football 20 yards. At age 11 Jackson won the South Florida FYFL Super Bowl. Jackson, his brother Jamar and the Northwest Broward Raiders beat the Fort Lauderdale Hurricanes, who had been back-to-back champions with a long winning streak. Jackson was the starting quarterback for the Raiders; but he was also the team's safety and place kicker. The Raiders won 14–6 as Jackson threw two touchdowns and kicked the extra points.

Jackson started his high school football career relatively late, not being on a team until his junior year of high school. Jackson attended Santaluces for his first two years of high school, before transferring to Boynton Beach High School in Boynton Beach, Florida. While there, Jackson was a successful read-option quarterback who could run and throw the ball equally well. He improved passing accuracy and decision-making by watching hours of film each week. In two years at Boynton Beach, Jackson threw for 2,263 yards and 31 touchdowns with nine interceptions. He also ran for 1,624 yards and 22 touchdowns, and had a quarterback rating of 102.7. A touchdown highlight Jackson scored against Village Academy went viral online, with The Palm Beach Post's Ryan DiPentima detailing:

Without any passing options down field, the dynamic QB rolled to his right, pump faked at the line of scrimmage and then took off for the end zone. He pointed at a Village Academy defender while beating him to the edge and then cut up field. Then, as another defender came flying in to make a tackle at the goal line, he hit the breaks [sic]. He just ... stopped. As the defender flew by him, Jackson strutted into the end zone and threw his hands up.

Jackson's last high school game came against a nationally ranked Miami Central High School team during the first round of the 2014 Florida High School Football Playoff 6A tournament. Boynton Beach was soundly defeated 49–6, with Jackson throwing two interceptions. He also competed for his high school track team, posting a personal record of 11.45 seconds in the 100 meter dash in one track meet. Jackson was named the Lou Groza Palm Beach County High School Player of the Year in 2014.

Jackson was rated three stars by ESPN.com and 247Sports, but four stars by Rivals.com. Despite the disagreement by recruiting companies over his caliber, he received offers from both Power Five schools like Louisville, Florida, Auburn, and Clemson, and mid-major programs like Akron, Western Kentucky, and Marshall. All of the major recruiting companies listed Jackson as a top 20 dual-threat quarterback, with 247Sports ranking him as high as #12. Jackson's in-state ranking also varied greatly, from as high as #51 from Rivals to as low as #80 by ESPN. Jackson visited only four schools (Louisville, Florida, Nebraska, and Mississippi State), and, after it appeared he might sign with Florida, Jackson ultimately committed to the University of Louisville. Head coach Bobby Petrino promised Jackson's mother that her son would be playing quarterback and nothing else.