Kalinn "Khaos" Williams (born March 30, 1994) is an American mixed martial artist who competes in the Welterweight division of the Ultimate Fighting Championship.

Williams got his first taste of knockouts in 2008 when he floored another teenager in a street fight and shook hands afterward.

In July 2013, Williams became the first graduate of a cooperative online education program between the Jackson County Sheriff's Office and Jackson Public Schools. Williams earned a high school diploma through an online program while incarcerated in Jackson County Jail after being convicted of selling cocaine. He's had a spotless probation record and has performed all his required community service.

He started training in September 2013 and had his first fight three months later. His interest in MMA started because someone saw him fight and told him that he had it. So afterwards, he found a BJJ gym and fell in love after his first bout. He started training with Leo Aponte, his former Jackson High School teacher and current mixed martial arts coach.

Starting his career in 2017, Williams fought for a variety of Michigan regional promotions, including King of the Cage events held there. He obtained a 9–1 record in this time, most notably winning the Total Warrior Combat Super Lightweight Championship against 36 fight veteran Tony Hervey.

Replacing injured Dhiego Lima on short notice, Williams made his promotional debut against Alex Morono at UFC 247 on February 8, 2020. He won the fight via first-minute knockout. This win earned him the Performance of the Night award.

Williams made his sophomore appearance in the organization against Abdul Razak Alhassan at UFC Fight Night: Felder vs. dos Anjos on November 14, 2020. He won the fight via first-minute knockout. This win earned him the Performance of the Night award.

Williams faced Michel Pereira at UFC Fight Night 183 on December 19, 2020. He lost the fight via unanimous decision.