Firas Katoussi (also spelled Katousi, born 6 September 1995) is a Tunisian taekwondo practitioner.

He won one of the bronze medals in the men's lightweight event at the 2022 World Taekwondo Championships held in Guadalajara, Mexico.

He represented Tunisia at the 2019 African Games held in Rabat, Morocco and he won the gold medal in the men's 74 kg event.

[1] He also won the gold medal in the men's 74 kg event at the 2019 Military World Games held in Wuhan, China.

He won one of the bronze medals in the men's 80 kg event at the 2022 Mediterranean Games held in Oran, Algeria.