Bengt Birgersson (1254 – 25 May 1291) was the youngest son of Birger Jarl.

While he was Archdeacon of Linköping Cathedral, he became chancellor to his brother, King Magnus.

In 1284, some time after the death of his brother Eric, and during the reign of Magnus, he was made Duke of Finland.

He is not known to have ever visited Finland, although he may have had responsibilities there related to the defence of Sweden's eastern borderlands.

Linköping's chronicle of bishops from 1523 tells of him: "Scriptores rerum suecicarum medii ævi".