Oliver Christensen (born 22 March 1999) is a Danish professional footballer who plays as a goalkeeper for Bundesliga club Hertha BSC and the Denmark national team.

Born in Kerteminde on the island of Funen, Christensen played in the youth department of his local club, Kerteminde Boldklub, before moving to Odense Boldklub (OB) at under-12 level. There, he progressed through the academy, and completed a trial with Manchester United in October 2016. In May 2017, Christensen signed a three-year professional contract with OB, and was promoted to the first team. On 26 August 2021, Christensen was sold to Bundesliga club Hertha BSC, where he signed a deal until June 2026.

Christensen played two games each for the Denmark under-18 team in 2017 and for the under-19 team in 2017 and 2018, respectively. After gaining a cap for the under-20 side in 2019, Christensen made his debut for the under-21 team on 10 September 2019. On 9 November 2020, Christensen was called up to Kasper Hjulmand's senior squad for the friendly against Sweden.