Valdimarsson is an Icelandic patronymic surname, literally meaning "son of Valdimar". People with the last name include:
Hákon Valdimarsson (born 2001), Icelandic footballer Hannibal Valdimarsson (1903–1991), Icelandic politician Helgi Valdimarsson (born 1936), Icelandic scientist Jón Steindór Valdimarsson (born 1958), Icelandic politician Þórarinn Ingi Valdimarsson (born 1990), Icelandic footballer
See also Valdimar Waldemar / Valdemar