Jillian DeCoursey

Background DeCoursey was born and grew up in Queens, New York, United States. DeCoursey started undergraduate studies at University of Bridgeport and graduated from Hunter College.

DeCoursey also eventually finished her postgraduate studies at Iona University, earning a master's degree and owns her counselling practice in mental health.

Invicta Fighting Championships DeCoursey made her promotional debut on August 31, 2017, at Invicta FC 25: Kunitskaya vs. Pa'aluhi against Ashley Medina. She won the fight via split decision.

Her next fight came on March 24, 2018, at Invicta FC 28: Mizuki vs. Jandiroba against Rebekah Levine. She won the fight via unanimous decision.

On July 21, 2018, DeCoursey faced Alesha Zappitella, replacing Shino VanHoose, at Invicta FC 30: Frey vs. Grusander.

For her next fight, DeCoursey fought outside of Invicta, being scheduled to face Katie Perez at CFFC 80. She won the fight by a third-round technical knockout.

DeCoursey returned to Invicta to face Linda Mihalec at Invicta FC 39: Frey vs. Cummins II. DeCoursey won the fight by unanimous decision.

DeCoursey was scheduled to challenge the reigning Cage Fury FC Strawweight champion Elise Reed at CFFC 91. Reed won the fight by unanimous decision.

DeCoursey was scheduled to participate in a one-night Invicta Phoenix Tournament to determine the next atomweight title challenger. DeCoursey lost the quarterfinal bout against Linda Mihalec by split decision.

DeCoursey faced Lindsey VanZandt on May 11, 2022, at Invicta FC 47. She won the bout after knocking out VanZandt in the first round.

Invicta FC Atomweight Champion DeCoursey was booked to challenge the reigning Invicta Atomweight champion Jéssica Delboni at Invicta FC 49: Delboni vs. DeCoursey on September 28, 2022. DeCoursey won the fight by a first-round submission.

DeCoursey was scheduled to defend the title against Rayanne dos Santos on May 3, 2023, at Invicta FC 53: DeCoursey vs. Dos Santos. She lost the title fight by unanimous decision.

On January 22, 2026, DeCoursey announced her retirement from MMA competition.

Professional grappling career DeCoursey was invited to compete in the flyweight division of the Combat Jiu-Jitsu world championship on December 20, 2020. She withdrew from the event.

DeCoursey is scheduled to compete in a superfight at Rise Invitational 11 on April 1, 2023, against Chelsea Mapa. Neither woman was able to secure a submission and the match ended in a draw.

Championships and accomplishments

Mixed martial arts

Invicta Fighting Championships Invicta FC Atomweight Championship (One time)

Mixed martial arts record Loss

Rayanne dos Santos Decision (unanimous) Invicta FC 53

Denver, Colorado, United States Win

Jéssica Delboni Submission (rear-naked choke) Invicta FC 49

Hinton, Oklahoma, United States Win

Lindsey VanZandt KO (punch) Invicta FC 47

Kansas City, Kansas, United States Loss

Elise Reed Decision (unanimous) Cage Fury FC 91

Lancaster, Pennsylvania, United States Win

Linda Mihalec Decision (unanimous) Invicta FC 39

Kansas City, Kansas, United States Win

Katie Perez TKO (punches) Cage Fury FC 80

Hampton, Virginia, United States Loss

Kelly D'Angelo Decision (unanimous) Invicta FC 35

Kansas City, Missouri, United States Loss

Alesha Zappitella Decision (unanimous) Invicta FC 30

Kansas City, Missouri, United States Win

Rebekah Levine Decision (unanimous) Invicta FC 28

Salt Lake City, Utah, United States Win

Ashley Medina Decision (split) Invicta FC 25

Lemoore, California, United States