Saif bin Sultan II was the sixth of the Yaruba dynasty of Imams of Oman, a member of the Ibadi sect. He held the position of Imam four times during a chaotic period of civil war and invasion by Persian forces.

The Yarubid dynasty were rulers of Oman between 1624 and 1742, holding the title of Imam. They expelled the Portuguese from coastal strongholds in Muscat and united the country. They improved agriculture, expanded trade and built up Oman into a major maritime power. Their forces expelled the Portuguese from East Africa and established long-lasting settlements on Zanzibar, Mombasa and other parts of the coast. The dynasty lost power during a succession struggle that started in 1712 and fell after a prolonged period of civil war.