Aaron Ern-Wuei Phillips (born August 5, 1989) is an American mixed martial artist who competes in the Bantamweight division. A professional since 2011, he is most notable for his time in the Ultimate Fighting Championship.

His mom came over from Penang, Malaysia to the US for university and met his father. She was a school teacher, so every summer he would go back to Malaysia from the age of four to eleven.

Phillips started fighting MMA professionally in 2011, mainly for regional Louisiana organizations, compiling a 7–0 record, before signing with the UFC in 2014.

Philips made his UFC debut as an injury replacement for Doo Ho Choi against Sam Sicilia on May 24, 2014 at UFC 173. However, Choi pulled out of the bout citing an injury. He lost the fight via unanimous decision.

Aaron Phillips faced Matt Hobar at UFC Fight Night: Henderson vs. dos Anjos on August 23, 2014. He lost the fight via unanimous decision.

After his second loss in a row, Phillips was released from the UFC.

After his release from the UFC, Phillips faced future UFC fighter Chris Gutiérrez for the vacant WFC Bantamweight Championship. Due to the bay doors not being able to be closed, the fight took place in 30 °F (−1 °C) cold. Due to an injury picked up during the fight, he was unable to continue, therefore losing the fight.

After this fight, due to injuries, he did not fight for 3 years before coming back in 2018 and picking up 4 straight wins in the World Fighting Championships organization. With a one off fight in VFL which he won by TKO, he was signed once again to the UFC.