Aosta:
Museo del Tesoro della Cattedrale, Piazza Papa Giovanni XXIII, Aosta. http://www.cattedraleaosta.it/it/Cattedrale+di+Aosta2/museo-del-tesoro-1
Ascoli Piceno:
- Diocesan Museum. www3.chiesacattolica.it/diocesiap/museo/informazioni.htm (It)
Assisi:
- Pro Civitate Museum, Assisi, Osservatorio Cristiana alla Cittadella di Assisi. With ca 2500 works by 20th-century and contamporary artists in the Galleria d'Arte Contemporanea della Pro Civitate Christiana, via degli Ancajani 3, Assisi, the Miserere series by Georges Rouault and ca 1500 works of old art. http://procivitate.assisi.museum (It)
Brescia:
Brixen/Bressanone:
(Brixen lies in the middle of South-Tirol, but it is an autonomous province that belongs to Italy)
Cortona:
- Diocesan Museum.
Ferrara:
- Cathedral museum.
Florence:
Frascineto:
Museo delle Icone e della Tradizione Bizantina.
Loreto:
Museo-Pinacoteca del Santuario di Loreto, Diocesan museum, with artworks from the Middle Ages till now.
Mantua:
- Diocesan museum.
Milan:
- Galleria d’Arte Sacra dei Contemporanei, Villa Clerici, Milano Niguarda. With modern and contemporary sacred art (Giacomo Manzù, Aldo Carpi, Floriano Bodini, Felice Carena, Francesco Messina, Enrico Manfrini, Libero Andreotti, Attilio Selva, Giuseppe Zigaina).
Montalcino:
- Diocesan Museum.
Montespertoli:
- Museo di Arte Sacra, Via S. Piero in Mercato, 233, 50025 Montespertoli (FI).
Napoli:
- Museo Diocesano Napoli, Largo Donnaregina, Naples. http://www.museodiocesanonapoli.com
- ARCA, Museo d’Arte Relogiosa Contemporanea, Piazza Santa Maria La Nova, 44 – Napels. The ARCA Museum aims to go beyond the classic concept of a museum display, with the aim of making contemporary interactions with artistic production of our time. It is divided into seven different locations in the ex-convent building and collects religious pieces of contemporary art from 1949 to date, made by national and international artists.
Reggello:
- Museo Masaccio d Arte Sacra, Via Casaromolo, 2/a - Cascia, 50066 Reggello.
Rome:
- Vatican Museums (Pinacoteca Vaticana). Among others:
* Sistine Chapel decorated by Michelangelo.
* Stanza della Segnatura decorated by Raphael.
* The Vatican Museum of Contemporary Religious Art. Artworks of 250 modern artists, not all Christian, but religious. Artists (among others): Ottone Rosai, Carlo Carrà, Mario Sironi, Aligi Sassu, Renato Guttuso, Maurice Utrillo, Giorgio Morandi, Filippo de Pisis, Umberto Boccioni, Giazomo Balla, Rodin, Chagall, Henry Morre, paul Klee, Kandinsky, Braque, De Chirico, Jacques Villon, Bernard Buffet, Kokoschka, Picasso, Bacon.
* Also the Ethnological Vatican Museum. Objects of above all a religious nature from four geographical areas (Asia, Oceania, Africa, America). This is flanked by a section called Missionary Synthesis which is a collection of works produced following mission.
- Museo Tipologico Internazionale del Presepio, “Angelo Stefanucci”, Via Tor de’ Conti, 31/a – Roma – 00184. Museum with 3000 nativity scenes through the centuries.
San Casciano:
- Cathedral Museum.
Teramo:
- Museo Stauros d’Arte Sacra Contemporanea, 64048 San Gabriele – Isola del Gran Sasso (Teramo).
Torre Pellice (TO):
- Museo Valdese. Museum about the Waldensians who lived in this part of Italy. It has a historical section about the history of the Waldensians from the Middle Ages till now, an ethnographical section about Waldensian life, a section about the mission in Africa, and one with liturgical objects. Exhibitions about Italian and European Protestantism and about contemporary art. Paintings by Paolo Paschetto and Filippo Scroppo are part of the collection of the museum. https://museovaldese.org/ (E, D)
Trapani (Sicily):
Udine:
- Museo d’Arte Sacra, Viale Ungherese 2, Udine.
Venice:
- Museo delle icone, Istituto Ellenico Venezia, Castello 3412.
For an elaborate list with many more museums of Christian and religious art in Italy , see Associazione Musei Ecclesiastici Italiani (AMEI), https://www.museiamei.it/