Mark Alexander McKenzie (born February 25, 1999) is an American professional soccer player who plays as center-back for Ligue 1 club Toulouse and the United States national team.

[5] McKenzie played college soccer at Wake Forest University starting in 2017, joining his academy teammates Matthew Real and Joseph DeZart.

[8] McKenzie's performance in the academy ranks earned him call-ups to the Bethlehem Steel FC roster, the Union's USL team.

[4] On January 18, 2018, McKenzie signed a homegrown player contract with Major League Soccer side Philadelphia Union.

[12] After losing his starting spot in the first team during the first half of the 2019 season, he reentered the line-up establishing himself as an initiator of attacks as a left-sided centerback.

[27] On February 1, 2020, McKenzie earned his first senior cap for the national team as a substitute in a friendly match against Costa Rica.