Oscar Carl Linnér (born 23 February 1997) is a Swedish professional footballer who plays as a goalkeeper for Liga I club Petrolul Ploiești.

[2][3] On 11 August 2021, Linnér joined Serie B club Brescia on a season-long loan deal, with an option to buy.

[9] With first goalkeeper Josip Posavec injured, Danish Superliga club AaB confirmed on 16 October that they had signed Linnér to a short contract for the remainder of 2022.

[10] After a short spell at IF Brommapojkarna in Sweden, Linnér returned to Denmark, signing a short-term deal with Danish 1st Division club Vendsyssel FF until the end of the season.

[12] On 5 November 2024, Linnér joined Romanian Liga I club Petrolul Ploiești on a deal until June 2026.