Matteo di Giovanni Online (original) (raw)
Fine Arts Museums of San Francisco NEW!
(Look for the "Image" links for super high resolution scans)
Madonna and Child with St. Catherine of Siena and St. Sebastian, ca.1480-90
The Crucifixion, ca.1490
The Magi Before Herod, ca.1490
Louvre Museum Database, Paris
Metropolitan Museum of Art, New York City NEW! 
National Galleries of Scotland, Edinburgh NEW!
National Gallery, London, UK
National Gallery of Art, Washington D.C. NEW!
Includes a biography of the artist
Ashmolean Museum at the University of Oxford, UK
Cincinnati Art Museum, Ohio NEW!
Madonna and Child with Angels and Saints Anthony of Padua and Nicholas of Tolentino
Cleveland Museum of Art, Ohio
Columbia Museum of Art, South Carolina
Madonna and Child with St. Catherine of Siena
Harvard University Art Museums, Massachusetts
Harvard have works in their collections, but unfortunately you have to type in the search yourself
Philadelphia Museum of Art NEW!
Phoenix Art Museum, Arizona
Head of the Madonna
State Museums of Florence Digital Archive, Italy
The Walters Art Museum, Maryland NEW!
Wallraf-Richartz-Museum, Cologne, Germany (mostly in German) 
National Art Databases and Museum Inventories:
UK National Inventory of Continental European Paintings (NICE)