Sebastian Denius Nielsen (born 8 June 1995) is a Danish retired professional footballer who played as an attacking midfielder.
Career Denius moved from Kjellerup to Skive in July 2018,Skive gafler Denius i Kjellerup, bold.dk, 11 July 2018 and to Kolding in July 2022. In January 2023, Kolding confirmed that Denius would also take on the role of transition coach, while remaining a player at the club.Sebastian Denius bliver transitionstræner i Kolding IF, kif-fodbold.dk, 19 January 2023 On 26 January 2024, the club confirmed that Denius had had his contract terminated as he was seeking more playing time.Christian Kudsk og Sebastian Denius takker af i Kolding IF, kif-fodbold.dk, 26 January 2024
On 16 February 2024, Denius joined Danish 2nd Division side Aarhus Fremad.Nyeste mand i truppen er Sebastian Denius..., facebook.com, 16 February 2024 In June 2025, after a season where the club gained promotion to the 2025-26 Danish 1st Division, Denius left the club.Fremad tager afsked med seks spillere, aarhus-fremad.dk, 14 June 2025
On 2 September 2025, Denius announced his retirement from football, at the age of 30.Sebastian Denius stopper karrieren, bold.dk, 2 September 2025
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