Sebastiaan Verschuren (born 7 October 1988) is a Dutch former competitive swimmer who specialized in short- and middle-distance freestyle events.

[1] At the 2016 European Aquatics Championships he won the gold medal in the 200 meter freestyle.

[2] After competing in the European Junior Swimming Championships in 2005 and 2006 Verschuren made his international senior debut at the 2006 European Aquatics Championships in Budapest, Hungary with a 19th position in the 1500 m freestyle.

Two years later he participated in the 2008 European Aquatics Championships in Eindhoven in his home country, where he reached 13th place in the 200 m freestyle.

In the 4 × 200 m freestyle, he finished 9th in the heats, just missing out on the final and qualification for the 2008 Summer Olympics.