Martis Karin Ersdotter (Våmhus, 2 July 1829 – 5 January 1902, Våmhus) was a Swedish businesswoman from Våmhus in Dalarna. She is the best known of the Hårkulla ("Hair-kulla"), the famous category of travelling businesswomen from Dalarna who manufactured and sold hair jewellery all over Europe in the 19th century. She was married to Martis Mats Andersson and was the mother of Anna Matsdotter (1862-1943) and the maternal grandmother of Eric Wickman.