Monte Fitzgerald Harrison (/mɒnˈteɪ/ mon-TAY; born August 10, 1995) is an American college football wide receiver for the Arkansas Razorbacks. He is also a former professional baseball outfielder who played in Major League Baseball (MLB) for the Miami Marlins and Los Angeles Angels.

Harrison played football, baseball and basketball at Lee's Summit West High School in Lee's Summit, Missouri. In football, he had 60 receptions for 1,007 receiving yards, 13 receiving touchdowns, 198 rushing yards, 12 rushing touchdowns and threw a touchdown pass as a senior. He committed to the University of Nebraska–Lincoln to play football in July 2013. He was considered one of the top prospects for the 2014 Major League Baseball draft and was also one of the top college football recruits. He was ranked as a four-star recruit by Rivals.com, and was their 33rd best wide receiver in the class. Harrison committed to play football at Nebraska over competing offers from schools such as Arkansas, Indiana, Iowa, Kansas, Kansas State, Kentucky, Michigan State, Missouri, Tulsa and Vanderbilt.

Harrison was drafted by the Milwaukee Brewers in the second round of the 2014 Major League Baseball draft. He signed with the Brewers on June 14 and was assigned to the Arizona League Brewers where he posted a .261 batting average with one home run and 20 runs batted in, along with 32 stolen bases, in 50 games.

In 2015, Harrison began the season with the Wisconsin Timber Rattlers, and after batting .148 with 11 runs batted in during 46 games, he was reassigned to the Helena Brewers, where he finished the season with a .299 average with three home runs and 13 runs batted in during 28 games. In 2016, Harrison returned to the Timber Rattlers and spent the whole season there, playing in 75 games, batting .221 with six home runs and 37 runs batted in. He spent the 2017 season with both Wisconsin and the Carolina Mudcats and posted a combined .272 batting average with 21 home runs, 67 runs batted in, and 27 stolen bases in 122 games between both clubs.

On January 25, 2018, the Brewers traded Harrison, Isan Díaz, Lewis Brinson, and Jordan Yamamoto to the Miami Marlins for Christian Yelich. MLB.com ranked Harrison as Miami's second best prospect going into the 2018 season. In 2018, Harrison spent the season with the Jacksonville Jumbo Shrimp, hitting .240 with 19 home runs, 48 runs batted in, and 28 stolen bases in 136 games. After the season, The Marlins added Harrison to their 40-man roster. In 2019, Harrison opened with the New Orleans Baby Cakes. He was named to the 2019 All-Star Futures Game. Over 56 games with New Orleans, he batted .274 with nine home runs, 24 runs batted in, and 20 stolen bases.

Harrison was promoted to the major leagues on August 3, 2020, and made his MLB debut the next day. In 32 games for Miami, he hit .170 with one home run and three runs batted in. Harrison also made his postseason debut that year with the Marlins against the Chicago Cubs in the 2020 National League Wild Card Series, where he pinch-ran and had one stolen base.

To begin the 2021 MLB season, Harrison was placed at the Marlins alternate training site. On April 30, Harrison was called up by the Marlins. Harrison went 1-for-5 in three games for the Marlins before being sent down on May 4 to Triple-A Jacksonville.

On March 18, 2022, Harrison was designated for assignment by Miami. He was released by the team on March 26.