Eysteinsson

Eysteinsson is a Scandinavian surname. Notable people with the surname include:


 * Halfdan Eysteinsson, the subject of Hálfdanar saga Eysteinssonar, a legendary saga from early 14th century Iceland
 * Rognvald Eysteinsson, founder of the Earldom of Orkney in the Norse Sagas
 * Sigtryg Eysteinsson, king of the Norwegian petty kingdoms Raumarike and Hedmark in the 9th century
 * Sigurd Eysteinsson (aka Sigurd the Mighty, ruled circa 875–892), the second Viking Earl of Orkney