Boëthius of Dacia (born ca. 1240, died between 1280 and 1290) was a Danish philosopher active at the University of Sorbonne in Paris, France.

Tied with Sigerus of Brabant, he was the most known proponent of Averroism, which is an interpretation of Aristotle founded on Averroës. He wrote several books in Latin, which have been collected in the six volumes of Boëthii Daci opera, printed in Copenhagen.

When averroism was banned in 1277, Boëthius left Paris. His later whereabouts are unknown. Some historians believe he died in Italy ca. 1282. Other sources says he died in Linköping, Sweden in 1290.