Heinrich von Tunna, also Heinrich Bart and sometimes inaccurately referred to as Herman Bart[1] (unknown - June 2, 1209) was the third Grandmaster of the Teutonic Order, heading the order from 1208 to his death in 1209.

Heinrich, now a childless widower, decided to make a pilgrimage to the Holy Land.

To finance the trip, he sold his piece of forest in Ettersberg to the Reinhardsbrunn monastery for 10 marks.

[3] After arriving in the Levant, he joined the Teutonic Order, and after three months (possibly in 1209) became Grandmaster in the wake of his predecessor, Otto von Kerpen's death.

The exact circumstances behind his sudden rise is unknown, though it demonstrates the fragility of the order at the time.