Severiano Boris "Seve" van Ass (born 10 April 1992) is a Dutch former field hockey player who played as a midfielder or forward for the Dutch national team.

[1] He is the son of Dutch field hockey coach Paul van Ass.

[3] In June 2019, he was selected in the Netherlands squad for the 2019 EuroHockey Championship and was named the captain for the tournament.

[5] After the winning final at the 2024 Summer Olympics, he announced his retirement.

In 2008 he switched to HGC,[7] with whom he won the 2010–11 Euro Hockey League.