Olaus Laurentii (died 25 June 1438) was a Swedish ecclesiastic who served as the archbishop of Uppsala from 1432 to 1438.
Olaus Laurentii (who is known under the Latin form of his Swedish name Olof Larsson) came from Uppland and studied at the universities of Prague, Leipzig and Paris.
Olaus had spent long periods in the previous years in Rome and was in good standing with the pope, but the king preferred bishop Arnold of Bergen.
In 1436, Olaus and the Privy Council of Sweden, over which he presided, turned their back on the king and joined the rebellion.
Olaus Laurentii is said to have died from poisoning by almond milk, and according to a later source the regent (later king) Karl Knutsson (Bonde) was responsible.