Baumburg Abbey is a former monastery of Augustinian Canons Regular in the northern Traunstein district of Bavaria, Germany.

The monastery St. Margareth zu Baumburg was founded by Count Berengar II of Sulzbach in 1107–1109 to fulfill his oath on the death of his wife Adelheid von Megling-Frontenhausen.

After the death of Berengar (3 December 1125) he challenged the legality of the separation of the two monasteries and appealed to the responsible bishop, Archbishop Conrad I of Salzburg (1106-1147), for an injunction to re-merge.

[5] After an arbitration awarded by Conrad in 1136 the separation of the two monasteries as wished by Berengar was reaffirmed, and in 1142 reconfirmed by Pope Innocent II.

[6] During the tenure of Gottschalk as provost of the Baumburg Abbey (to 1163) a church of St. Nicholas was consecrated in 1129, and in 1156 the Romanesque Basilica of St. Margaret was built.

The Collegiate School regained its good reputation among the nobility, and the number of canons increased again.

The provosts Michael Doegger (r. 1688–1706) and Patricius Stöttner (r. 1707–1737) led the conversion and new construction of the monastery buildings.

On the occasion of the 600th anniversary of consecration in 1755 the architect Franz Alois Mayr from Trostberg built the present church of St. Margareta in the Rococo style with stucco filigrees and frescoes.