Rasmus Sebastian Holmén (born 29 April 1992) is a Swedish professional footballer who plays as a centre back for Allsvenskan club IF Elfsborg.

Holmén made his debut in Allsvenskan on 22 April 2013 against Djurgården, replacing injured Jon Jönsson.

[2] On 24 July 2019, he signed a two-year contract with the Dutch club Willem II.

[4] He made his full international debut for the Sweden national team on 15 January 2015 in a friendly 2–0 win against the Ivory Coast, replacing Johan Mårtensson in the 89th minute.

Sebastian is the younger brother of the former Sweden national team midfielder Samuel Holmén.