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 competed in wrestling in high school, and began training in mixed martial arts at the age 19 in 2009.

[6] 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.

[10] Giagos faced Jorge de Oliveira on March 21, 2015 at UFC Fight Night 62.

[14][15] He made his debut in Russia promotion against Alexandre Pimentel of Brazil at ACB 51: Silva vs. Torgeson on January 13, 2017.

In the second match he will make fight against Shamil Nikaev at ACB 71: Yan vs. Mattos on September 30, 2017.

On the heels of a 4–2 run on the regional circuit, Giagos made his return to the promotion against Charles Oliveira on September 22, 2018 at UFC Fight Night 137.

[27] Giagos replaced Rick Glenn and faced Carlton Minus at UFC Fight Night: Thompson vs. Neal on December 19, 2020.

[30] However, Álvarez was removed from the bout in early May due to alleged visa issues that restricted his travel.

[37] Giagos was scheduled to face Benoît Saint-Denis on September 3, 2022 at UFC Fight Night 209.