Oscar Wallblom, born 23 November 1979 in Gothenburg, Sweden, is a Swedish musician and bassist best known for his long-standing role as a core member of Håkan Hellström’s band, appearing on all studio recordings and live performances since the start of Hellström’s solo career in 2000. He has also played with groups such as Augustifamiljen and Hästpojken, contributing both bass and backing vocals.