Nattawat Jirochtikul (ณัฐวรรธน์ จิโรชน์ธิกุล; born October 18, 2004), nicknamed Fourth (โฟร์ท), is a Thai actor and singer under GMMTV and Riser Music. He is currently attending the Faculty of Law at Chulalongkorn University. Fourth started in the entertainment industry in 2019 when he became one of the two winners of the GMMTV's star search competition "Thailand School Star 2019". He made his acting debut in 2021 with a supporting role in the series "F4 Thailand: Boys Over Flowers" (หัวใจรักสี่ดวงดาว). Aside his acting and singing career, Fourth owns the clothing brand 'NU MO NE' (นิว โม เนะ).