Münster Frauenchiemsee, Abbey church on Fraueninsel, Chiemsee, Germany.

Münster Frauenchiemsee is a church on Fraueninsel island in Bavaria's Chiemsee lake, featuring a separate bell tower standing beside the main building. The structure displays Romanesque and Gothic architectural elements that reveal its long construction history.

The convent was founded around 772 and became one of the earliest religious communities for women in German-speaking lands. The church underwent multiple reconstructions and expansions over the centuries to reach its present form.

The church is dedicated to the Presentation of Mary (Mariä Opferung). Since 1929 the Blessed Irmengard has been venerated in the lower chapel, where her relics were moved into a glass shrine beneath the altar; she was a daughter of King Louis the German, served as the first named abbess around 850 and died here in 866. A 1713 Marian brotherhood is depicted in the Rococo frescoes of the Maria-Mitleid-Kapelle.

The island is accessible only by regular ferry service from the mainland during the season. The site is small and works best when explored at a slow pace, taking time to walk around the grounds.

The free-standing bell tower is octagonal from the ground up and measures 8.80 metres across, which is unusual for such a structure. It was probably built in the second half of the 10th or in the 11th century as a defensive and refuge tower, as the regular window openings facing all sides suggest. Only later was it raised and converted into a bell tower; its onion dome dates from the end of the 16th century after several fires.