Arcidiecézní muzeum Olomouc, Religious museum and cultural monument in Olomouc, Czech Republic.

The Archdiocesan Museum is an art museum in Olomouc housed within historic buildings that form part of the medieval castle complex in the city. The rooms contain religious artworks from different time periods, along with old manuscripts and printed materials.

The deanery's land was acquired in 1267 by Dean Bartoloměj from King Přemysl Otakar II. In 1306 King Wenceslas III, the last Přemyslid, was lodged here and murdered on 4 August. After a 1380 fire the purkrabství was rebuilt as a palace, and in 1524 the whole complex underwent a Renaissance reconstruction. The museum opened in 2006 after restoration by HŠH Architekti (1998–2006).

The museum opened in 2006 in the renovated deanery, St Barbara's Chapel, St Anne's Church and Zdík's Palace on Wenceslas Square. In 2015 it received the European Heritage Label, the first in the Czech Republic. The Erbovní sál, reached by its own staircase with a wrought-iron Rococo grille, displays the coats of arms of 261 noble canons.

The museum entrance is on Václavské náměstí, and a new reinforced-concrete link connects the deanery with the bishop's palace, fully opened to visitors after a two-year renovation in 2023. The attic holds an exhibition on the development of the Wenceslas Hill; original wooden floors in the Baroque first-floor halls were restored.

In 1767 Wolfgang Amadeus Mozart stayed in the deanery while ill with smallpox; after recovering he composed a symphony in F major and dedicated it to Olomouc. A stone plaque on the so-called Bloody Balcony recalls the murder of King Wenceslas III here on 4 August 1306.