Astrid Wanja Brune Olsen (born 23 June 1999) is a Norwegian tennis player. Brune Olsen has a Norwegian father and a Kenyan mother. On 12 August 2019, she achieved her career-high singles ranking of world No. 880. On 3 February 2020, she peaked at No. 626 in the WTA doubles rankings. Playing on the ITF Junior Circuit, Brune Olsen had a career-high ranking of 47, achieved in April 2017. Since 2017, she has represented Norway in the Fed Cup, where she has accumulated (as of October 2020) a win–loss record of 6–5.