Mathias Andreasen (born 8 October 2003) is a Danish professional footballer who plays as a forward for Danish 2nd Division club Næstved Boldklub.

Career Andreasen is a product of Hvidovre IF's talent department, where he made it all the way to the first team. On 10 August 2021, Andreasen made his official debut for Hvidovre in the Danish Cup in a match against Herstedøster IC.HERSTEDØSTER VS. HVIDOVRE 1 - 9, Soccerway, 10 August 2022

From his debut until December 2022, Andreasen played for Hvidovre's U-19 and U-23 teams. Then, in the aforementioned month, he signed his first contract with Hvidovre and was promoted to the first team at the same time.19-årige Mathias Andreasen: Håber jeg kan fortsætte med en masse mål..., hvidovreavis.dk, 7 December 2022 From the start of the year until the end of the season, Andreasen appeared in 11 games, contributing to Hvidovre's promotion to the 2023-24 Danish Superliga.

On 21 July 2023, Andreasen made his debut in the top Danish league in a match against FC Midtjylland.MIDTJYLLAND VS. HVIDOVRE 1 - 0, Soccerway, 21 July 2023

On 18 August 2025, Andreas left Hvidovre to join Danish 2nd Division club Næstved Boldklub.Ny grøn spiller, naestvedboldklub.dk, 19 August 2025Mathias Andreasen skifter til Næstved Boldklub, hvidovrefodbold.dk, 18 August 2025

Personal life Alongside his football career, Andreasen works at a bank.Når professionel fodbold går hånd i hånd med bankkarriere, sparnord.dk, 27 April 2023

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