Marta Christine Sandal (31 January 1878 – 2 March 1930) was a Norwegian mezzo-soprano, best known for singing songs by Edvard Grieg.

She was a soloist in the choir before King Oscar II, who later facilitated her admission to Music Conservatory in Christiania, where she was mentored by Hildur Schirmer.

[3] On 6 June 1903, Sandal married cellist Henri Bramsen and performed with him for several years, including in Finland and Saint Petersburg.

After receiving a letter of recommendation from Grieg in 1906, Sandal travelled to the United States with her husband, initially settling in Pittsburgh.

After their marriage broke up and Bramsen returned to Europe, Sandal remained in the United States and remarried in 1914 to an American farmer of Norwegian origin.