Sebastian Ross (born 7 May 1993) is a professional Australian rules footballer playing for the St Kilda Football Club in the Australian Football League (AFL). He is the cousin of Jobe Watson and nephew of Tim Watson. Ross was recruited by the club with draft pick 25 in the 2011 National Draft. He made his debut in Round 22, 2012, against Greater Western Sydney at Docklands Stadium.
On August 20, 2016 he received the Ian Stewart Medal for best on ground in the Saint's Round 22 victory over Richmond. In 2017 and 2019 he won the Trevor Barker Award for St Kilda's best and fairest.