| Seve van Ass | |
| Fullname: | Severiano Boris van Ass |
| Birth Date: | 10 April 1992 |
| Birth Place: | Rotterdam, Netherlands |
| Height: | 1.78 m |
| Weight: | 70 kg |
| Position: | Midfielder / Forward |
| Youthclubs1: | Victoria |
| Years1: | –2008 |
| Clubs1: | Victoria |
| Years2: | 2008–2013 |
| Clubs2: | HGC |
| Years3: | 2013–2018 |
| Clubs3: | Rotterdam |
| Years4: | 2018–2024 |
| Clubs4: | HGC |
| Nationalyears1: | 2011–2024 |
| Nationalteam1: | Netherlands |
| Nationalcaps1: | 236 |
| Nationalgoals1: | 29 |
| Show-Medals: | no |
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.[2]
He participated at the 2016 Summer Olympics.[3] In June 2019, he was selected in the Netherlands squad for the 2019 EuroHockey Championship and was named the captain for the tournament.[4] They won the bronze medal by defeating Germany 4–0.[5] After the winning final at the 2024 Summer Olympics, he announced his retirement.[6]
Van Ass started playing hockey at Victoria, a field hockey club in Rotterdam. In 2008 he switched to HGC,[7] with whom he won the 2010–11 Euro Hockey League. In 2013 he returned to Rotterdam to play for HC Rotterdam, where he played for five seasons until 2018 when he returned to HGC.[8] In his last season before his retirement HGC was relegated from the Hoofdklasse.[9]