Nattawat Jirochtikul (ณัฐวรรธน์ จิโรชน์ธิกุล; born October 18, 2004), nicknamed Fourth (โฟร์ท), is a Thai actor under GMMTV and a singer under Riser Music. He is currently attending the Faculty of Law at Chulalongkorn University.

He began his career when he joined and won GMMTV's reality 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).

Fourth owns the clothing brand Nu Mo Ne (นิว โม เนะ).