Alijah Arenas is an American basketball player who currently attends Chatsworth High School in Los Angeles, California.

Arenas was born in Oakland, California and grew up in the Woodland Hills neighborhood of Los Angeles, California. He attends Chatsworth High School. He averaged 33 points and 8.6 rebounds per game as a sophomore. Arenas reclassified midway through his junior year from the class of 2026 to the class of 2025. He was selected to play in the 2025 McDonald's All-American Boys Game.

Arenas is the son of former NBA All-Star Gilbert Arenas.

On Thursday, April 24, 2025, it was reported that Arenas was involved in a serious car crash and was hospitalized and placed into an induced coma. According to a Los Angeles Fire Department public information officer, officials responded to a call at 4:55 a.m. after a Tesla Cybertruck crashed into a tree/fire hydrant with fire involved. The LAFD did not identify the person involved but said that the 18-year-old driver was out of the vehicle and that he was transported to the hospital in serious condition. Sources confirmed that Arenas was involved in the crash and told ESPN that initial tests showed he did not suffer broken bones.