Mari Kalkun (born 1 April 1986) is an Estonian singer and musician who specializes in contemporary folk music.
She has performed at home and abroad in concerts with the ensemble Runorum, releasing several recordings since 2007.
In 2013, she was voted best singer at Estonia's Ethno Music Awards.
Her widely acclaimed 2018 album Ilmamõtsan consists of songs inspired by Estonia's traditional folk music, especially that from the villages of Kalkun's native Võru in south-eastern Estonia.