The Dom-Museum Bremen is the museum of Bremen's St. Petri Cathedral. It is an ecumenical museum for the history of the Church of Bremen, founded in 1987 to record the finds from the tombs of the medieval bishops of the Cathedral.

The need to establish a museum arose during the last major restoration called the Cathedral (1973-1976), when substantial excavations were carried out which brought to light several bishop's tombs that are part of a collective tomb from the early 13th century and others finds prior to the pre-Romanesque construction. Inside the tombs the insignia and liturgical vessels were found: bishop's staffs, rings, chalices and patens. Finds outside the tombs mainly include coins, precious textiles, some pottery fragments and metal objects. The entrance to the museum in the corner between the high choir and the southern transept leads into a room with wall and vault paintings, paintings that were made at the beginning of the 15th century, when a chapel dedicated to the Virgin was set up here. Today stone finds are preserved, such as the coffin of Archbishop Bezelin found during excavations in 1974, the sandstone relief of the Holy Communion (early 15th century) and the double relief depicting the Saints Cosma and Damiano (around 1400). Then there are the oldest finds in the museum: two animal reliefs from the 11th / 13th century. Upstairs, the so-called silver room is dedicated to the history of the diocese of Bremen and the historic silver altar. There are candlesticks and chalices from 1400 to 1869, the "Missale secundum ritum ecclesie Bremense" from 1511, ie the oldest book in the collection of the Cathedral library with the description of the rite of mass, valid only in Bremen. A further large hall is dominated by paintings, including a painting by Lucas Cranach the Elder.