Ragnhildis Olafdottir, also known as Ragnhild, (c.1115 - unknown) was the daughter of king Óláfr Guðrøðarson of the Kingdom of Mann and Ingibiorg Hakonsdottir,[2] making her a granddaughter of Haakon Paulsson.

Ragnhild married the Norse-Gaelic lord Somerled,[3][4] king of the Kingdom of the Isles.

[6] Ragnhild is important to Clann Somhairle because she gives the clan and its descendants royal status on the basis of their descent from the Crovan Dynasty and the Uí Ímair Dynasty,[7] because her father Óláfr Guðrøðarson was the son of Godred Crovan.

[8] Ragnhild's place in Manx dynastic politics also strengthened claims by further descendants.

[9] Historian R. Andrew Macdonald recounts how the Chronicles of Mann describes how the wife of Somerled was the "cause of the collapse of the entire kingdom of the Isles" because the kingdom would fall under the control of Clann Somhairle and would become divided which ultimately led to its collapse in the mid 13th century.