Paolo de' Matteis art links 

J. Paul Getty Museum, Los Angeles
Allegory of Divine Wisdom, 1680

Kress Foundation Collection   NEW!
(Look for the "Image" links for super high resolution scans)
Andromeda and Perseus, ca.1710

Kunsthistorisches Museum Databank, Vienna (in German)  

Paolo de' Matteis at the Louvre Museum, Paris
The Choice of Hercules, pen and ink drawing, 1712

Louvre Museum Graphic Art Database, Paris (in French)   NEW!  

Museum of Fine Arts, Boston  
Paintings collection online

Ashmolean Museum at the University of Oxford, UK

Courtauld Institute of Art, London, UK
Galatea

Guilford College Art Gallery, North Carolina
Note that the JPG image is displayed smaller than its actual size

Harvard University Art Museums, Massachusetts

Musei Civici di Macerata, Marche Region, Italy (in Italian)  
Venere offre le armi ad Enea

Museo Nazionali di Capodimonte, Naples, Italy (in Italian)   NEW!  

Saint Louis Art Museum, Missouri
The Annunciation, 1712

Paolo de' Matteis at the Smithsonian American Art Museum, Washington D.C.

 
National Art Databases and Museum Inventories:

Art Fund for UK Museums
The Choice of Hercules, 1712

UK National Inventory of Continental European Paintings (NICE)   NEW!

 

Ciudad de la Pintura (in Spanish)  

 

Grove Dictionary of Art Online (excerpt)  

Union List of Artist Names (Getty Museum)  
Reference sheet with basic information about the artist and pointers to other references.