Eirik Magnusson (c. 1268 - 1299), king of Norway from 1280 until 1299.

Erik married princess Margaret of Scotland (daughter of king Alexander III) in 1281. Margaret died two years later in labour, giving birth to Margaret, Maid of Norway (d.1290). The young Margaret was to become queen of Scotland in 1286.

He was later remarried to Isobel Bruce, daughter to Robert de Brus, 6th Lord of Annandale and Marjorie of Carrick, 3rd Countess of Carrick. Isobel was also sister to Robert I of Scotland and Edward Bruce.