Olaf II Haraldsson (995 – July 29, 1030), later known as Olaf the Saint, is King of Norway from 1015 to 1028.

He is posthumously given the title Rex Perpetuus Norvegiae (English: Norway's Eternal King) and canonized in Nidaros (Trondheim) by Bishop Grimkell, one year after his death in the Battle of Stiklestad on July 29, 1030.

Enshrined in Nidaros Cathedral.

Olaf's local canonization is in 1164 confirmed by Pope Alexander III, making him a universally recognized saint of the Catholic Church.

The exact position of Saint Olaf's grave in Nidaros has been unknown since 1568, due to the Lutheran iconoclasm in 1536–37.

Saint Olaf has today a prominent legal as well as cultural position in the country.

He is symbolised by the axe in Norway's coat of arms, and the Olsok (July 29) is still his day of celebration.

The Order of St. Olav is named after him.