Stephen Silvagni (born 31 May 1967) is a former Australian rules footballer who represented Carlton in the Australian Football League (AFL).
As the second member of three generations of Silvagni's represent the Blues, he is regarded as one of the greatest ever full-backs to play the game and was named as full-back in the AFL Team of the Century and is an inductee in the Australian Football Hall of Fame.
Prior to 1985 he captained the undefeated Marcellin College 1st XVIII that won both the 1984 Associated Grammar Schools premiership, and the coveted Herald Shield Cup then played under lights at Waverley Park.
He is widely known by his nickname, "SOS" (pronounced "Soss"), standing for "Son of Serge", referring to his father, Sergio Silvagni, another great Carlton player.After retiring from football, Silvagni has worked as an assistant coach and list manager at several AFL clubs.
He is currently the list manager at Carlton Football Club.