The Diocesan and Cathedral Museum of Mondoñedo was created at the beginning of 1968. Later on, the museum was expanded to end up occupying a large amount of spaces in the cathedral.

The museum houses a selection of 15th century English alabasters from London and Nottingham workshops, as well as a Magdalene altarpiece 15th century, with a 15th century image. The museum also shows large 16th century Flemish panels and important pieces made of silver and ivory: sticks, trays, goblets, monstrances, processional cross and candle holders.

In the upper floor, the visitor will stroll by two big gothic halls with altarpieces, canvas, and a collection of over 300 sculptures, great choral books and a collection of liturgical clothing of great historical and artistic value.