Seth Isaac Johnson (born July 10, 2000) is a Canadian actor, most recently known as Max, the protagonist's younger brother, in Megan Park's 2024 comedy-drama film My Old Ass, and in the recurring role of Eugene in Season 2 of the hit series Firefly Lane.
Early in his career, Johnson was notable for his recurring dramatic role as Denny Larsen in AMC's The Killing.
Appearing in over 20 episodes, Seth delivered a raw, heart wrenching performance as the younger brother of a murdered girl.
Award winning director Patty Jenkins wrote of Seth, "He is truly exceptional and gifted beyond his years...He was a joy to work with in all regards and it was this and his talent that helped create the masterful series "The Killing” became”.
Johnson was nominated for “Best Guest Performance” for his portrayal of Shawn Raider in the Supernatural episode “Advanced Thanatology” in the 2018 Leo Awards.