Sam Johnston is a Canadian politician and martial artist, who was elected to the Legislative Assembly of New Brunswick in the 2024 election. He was elected in the riding of Miramichi Bay-Neguac, unseating Progressive Conservative member Réjean Savoie.
Prior to his election, he served on Miramichi City Council. He is also a taekwondo practitioner and holds an 8th-degree black belt rank.
Johnston is a graduate of the University of New Brunswick, where he earned a Bachelor of Arts, a Bachelor of Education, and a Master of Education.
Johnston was previously diagnosed with Acute myeloid leukemia. He underwent a stem cell transplant and returned to practicing taekwondo after his recovery. In 2017, he won a gold medal in the Senior Master Integration Division at the World Taekwondo Hanmadang held in South Korea. He is one of the 2026 inductees of the New Brunswick Sports Hall of Fame.