UFC

Casey “King”O'Neill

UFC12-2-0

Division
Women's Flyweight
Stance
Orthodox
Height
5' 6"
Weight
125 lbs.
Reach
69"
Nationality
Irvine, United Kingdom
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Fighter metrics

Striking accuracy

56%

172 landed · 307 attempted

Takedown accuracy

50%

Recent fight form

Latest 5 verified results in our archive · 2023-03-18 to 2026-09-19

Wins

3 / 5

Losses

2 / 5

Historical results, not a prediction. See opponents and methods in fight history below.

Fight history

Casey O'Neill Bio

Casey O’Neill is a Scotland-born, Australian-raised mixed martial artist who competes in the UFC women’s flyweight division under the nickname “King.” The UFC lists her as an active athlete, born in Irvine, Scotland, on October 7, 1997. She is listed at 5 feet 6 inches tall with a 69-inch reach and trains at Bangtao Muay Thai. O’Neill began kickboxing as a child alongside her father and later added Brazilian jiu-jitsu and MMA to her training.

O’Neill turned professional in 2019 and made her UFC debut on February 20, 2021, stopping Shana Dobson. Her early UFC run included a rear-naked-choke submission of Lara Procopio and a stoppage of Antonina Shevchenko. Before reaching the UFC, she held two regional strawweight championships in Australia. Her official UFC profile describes a brown belt in jiu-jitsu, while her stated favorite striking technique is boxing and her favorite grappling approach is joint locks. She did not attend college, choosing to commit fully to fighting before finishing high school.

Record
12-2-0
Division
Women's Flyweight
Fighting style
MMA
Stance
Orthodox
Height
5' 6"
Weight
125 lbs.
Reach
69"
Leg reach
37.00
Nationality
Irvine, United Kingdom
Birth date
Oct 7, 1997 (age 29)
Age
29
Country
Australia

Casey O'Neill Questions & Answers

What UFC division does Casey O'Neill compete in?

As of October 14, 2026, Casey O'Neill is listed by the UFC as an active competitor in the women’s flyweight division.

How tall is Casey O'Neill?

The UFC lists O'Neill at 5 feet 6 inches tall, with a 69-inch reach.

Where does Casey O'Neill train?

O'Neill’s UFC athlete profile lists Bangtao Muay Thai as her training base. In a September 2026 UFC feature, she described returning to Bangtao Muay Thai & MMA in Thailand as a move that helped her reconnect with the environment where she began her professional career.

When did O'Neill make her UFC debut?

O'Neill made her UFC debut on February 20, 2021, against Shana Dobson. The UFC records the result as a second-round stoppage by strikes.

Did Casey O'Neill hold titles before joining the UFC?

Yes. O'Neill’s UFC profile says she was a two-time regional strawweight champion in Australia and holds a brown belt in jiu-jitsu.

What is Casey O'Neill’s fighting style?

O'Neill is listed as an MMA fighter. She began kickboxing as a child, later added Brazilian jiu-jitsu and MMA, and identifies boxing as her favorite striking technique and joint locks as her preferred grappling technique.

Did Casey O'Neill attend college?

No. Her UFC profile says she began fighting before finishing high school and chose to focus fully on her fighting career rather than pursue college.