Rósa Björk Brynjólfsdóttir (born 9 February 1975) is an Icelandic politician who was a member of the Althing (Iceland's parliament) for the Southwest Constituency from 2016 to 2021 and a media representative of the Ministry of Finance from 2010 to 2014.
She left the Left-Green Movement in 2020, due to dissatisfaction with the policy of Katrín Jakobsdóttir's policies on matters of refugees and asylum seekers.