Duncan Stewart is a fictional character from the Australian soap opera Home and Away. He made his first appearance during the episode broadcast on 14 June 1989. He was initially portrayed by Allana Ellis, with actor Lewis Devaney taking over the role from 1990 to 1998. Brendan McKensy assumed the role in 1998 until Duncan's departure in 2001. McKensy later reprised the role in 2004 and 2005 and made his last appearance on 13 July 2005. The character was reintroduced on 19 July 2016, with Benedict Wall cast in the role. Duncan is the son of Ailsa (Judy Nunn) and Alf Stewart (Ray Meagher). His 2016 reappearance marked the first time in 27 years that he, Alf and his half-sister Roo Stewart (Georgie Parker) had been on-screen together. During his time in Summer Bay, Duncan befriends Tori Morgan (Penny McNamee), becoming a love rival for Nate Cooper (Kyle Pryor).