Oliver Provstgaard Nielsen (born 4 June 2003) is a Danish professional footballer who plays as a centre-back for Danish Superliga club Vejle Boldklub.

Provstgaard joined Vejle Boldklub as an U13 player from Bredballe IF.^[1] He played his way up through the youth ranks at Vejle. 17-year-old Provstgaard was selected for Vejle's first team for the first time when he was in the squad for a Danish Cup game against Hobro IK on 7 October 2020. Provstgaard, however, had to watch the entire match from the substitutes' bench.^[2] Two months later, Provstgaard suffered a serious knee injury in an U-19 match, requiring surgery and an 8-month break.^[3]

However, although he was injured, the club confirmed on 7 June 2021, that Provstgaard had signed a new deal until June 2024, which would take effect from 1 January 2022. At the same time, he would become a permanent part of the first team squad.^[4] On 27 May 2022, Vejle once again gave Provstgaard a new contract, this time until June 2026.^[5]

With a number of injuries in Vejle's defence, Provstgaard made his official debut for the club on 14 April 2022 against OB in the Danish Superliga, where he played the entire match.^[6][7]