Rosa Kostandyan, known professionally as Rosa Linn, is an Armenian singer. She is part of the Nvak Collective founded by Tamar Kaprelian, who represented the country at Eurovision in 2015 as part of Genealogy.
In 2013, she participated in the Armenian national selection for Junior Eurovision with the song "Gitem".
On 11 March 2022, AMPTV announced that Rosa would represent Armenia at the Eurovision Song Contest 2022 in Turin with the song Snap. She finished in 20th place in the grand final.