Boetius of Dacia was an Aristotelian and Averroist philosopher of the thirteenth century, sometimes called Boetius of Sweden, after the country of his birth. Born during the first half of the century, he was probably a secular cleric and canon of the diocese of Linköping. He was an associate of Siger of Brabant as a teacher of philosophy in the faculty of arts at Paris and, as a leader of the Averroist movement, condemned in 1277 by Stephen Tempier, bishop of Paris. With Siger, Boetius fled the city after the condemnation and appealed to the pope. After detention at the pontifical curia at Orvieto, Boetius joined the Dominican order as a member of the province of Dacia. The date of his death is unknown.

Boetius wrote works on logic, natural philosophy, metaphysics, and ethics. Some of these are...