Maggie Vessey (born December 23, 1981) is an American athlete who competes in middle distance track events.

Vessey represented the United States at the 2009 World Championships in Athletics and 2011 World Championships in Athletics in the 800 m. Vessey grew up in Soquel, California and attended Monte Vista High School and Soquel High School.

While competing for Cal Poly-San Luis Obispo, Vessey was the Big West Conference 800 m champion twice.

[6] She qualified for the finals of the 800 m at the 2011 World Championships in Athletics, where she finished fourth, moving up from sixth place later because of the disqualification of Russian Mariya Savinova and Yekaterina Kostetskaya.

[7] A week later, Vessey won the 800 m in 1:58.64 at the Hanžeković Memorial as part of the IAAF World Challenge Meetings.

[9] On December 21, 2012 Vessey accepted a public warning and loss of results for testing positive for canrenone.

[10] Maggie rejoined Coach Greg Brock in 2014 and subsequently ran the three fastest 400m times of her career including a 52.82 clocking at the 2014 Occidental Invite.