Nicholas Alexander Leendert Vlastuin (pronounced [flɒs təʊn]; born 19 April 1994) is a professional Australian rules footballer playing for the Richmond Football Club in the Australian Football League (AFL). He is a three-time premiership player with the club, winning in 2017, 2019 and 2020. He plays as a hybrid defender, adept at directly defending small forwards, taking intercepting marks and rebounding from defensive 50.