Joel Untersee (born 11 February 1994) is a South African footballer who currently plays as a defender for Empoli.
Born in Johannesburg, South Africa, of Swiss descent, Untersee moved to Switzerland at a very young age and opted to represent Switzerland at various youth levels internationally. Following his move, Untersee joined the youth academy of FC Zürich, where he would eventually remain until 2010, before transferring to Italian giants, Juventus Football Club during the 2010–11 season.
On 28 October 2010, Untersee officially left FC Zürich to join Juventus, where he was assigned to the youth team. After a successful debut season in Italy, Untersee was called up to the first team training camp in the summer 2011 by new head coach Antonio Conte. Following the summer ritiro, however, the young fullback returned to the youth sector for the 2011–12 season and remained during the 2012–13 campaign as well.