Marcell Harris (born June 9, 1994) is an American professional football linebacker.

[4] In Week 16 against the Chicago Bears, Harris made a late hit on Mitchell Trubisky.

[7] During Week 13 against the Baltimore Ravens, Harris forced a fumble on quarterback Lamar Jackson and recovered the football during a narrow 20–17 road loss.

[8] The 49ers reached Super Bowl LIV, but lost 31–20 to the Kansas City Chiefs.

[9] At the beginning of the 2021 NFL season, it was reported that Harris was making the switch from strong safety to linebacker.