Alpin II of Dalriada, also known as Alpin mac Eochaid was the father of Kenneth I of Scotland and Donald I of Scotland who united the Kingdom of the Scots and the Picts.

Little is known about Alpin other than that his father was Eochaid IV of Dalriada, who has been called in some acounts the King "of Scotland". This title was probably a ceremonial one.

He married a Scottish princess, who name is now no longer known, and had two sons by her.

Alpin was certainly dead by 840, when his son, Kenneth, took the kingship of Dalriada. A late source states that he died in 834 fighting the Picts in Galloway. He did not succeed to the kingship.