Christos Giagos (born January 23, 1990) is an American professional mixed martial artist who competed in the lightweight division in the Ultimate Fighting Championship (UFC).

Giagos was born and raised in Southern California. Giagos competed in wrestling in high school, and began training in mixed martial arts at age 19 in 2009. He is a Greek American.

Giagos made his professional mixed martial arts debut in 2009 competing as a lightweight primarily in regional promotions across California. He was able to compile a record of 10–2, including winning the RFA Lightweight Championship on August 22, 2014 with a TKO stoppage of Dakota Cochrane. On the heels of that victory, Giagos signed with the UFC in the fall of 2014.

Giagos made his promotional debut against Gilbert Burns on October 25, 2014 at UFC 179. He lost the bout via submission in the first round.

Giagos faced Jorge de Oliveira on March 21, 2015 at UFC Fight Night 62. Giagos won the fight via submission in the first round.

Giagos faced Chris Wade on June 6, 2015 at UFC Fight Night 68. He lost the fight by unanimous decision and was subsequently released from the promotion.

He made his debut in Russia promotion against Alexandre Pimentel of Brazil at ACB 51: Silva vs. Torgeson on January 13, 2017. He won the fight unanimous decision.

In the second match he will make fight against Shamil Nikaev at ACB 71: Yan vs. Mattos on September 30, 2017. He lost the back-and-forth fight by split decision.