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- Oakville Galleries (0 artworks) – Oakville, Canada
- Oglethorpe University Museum (4 artworks) – Atlanta, GA, USA – artworks
- Ohara Museum of Art (1 artworks) – Kurashiki, Japan – artworks
- Oklahoma City Museum of Art (11 artworks) – Oklahoma City, OK, USA – artworks
- Old Speech Room Gallery and Museum - Harrow School (0 artworks) – London, UK
- Omsk Museum of Fine Arts (4 artworks) – Omsk, Russia – artworks
- One Gallery (2 artworks) – Jakarta, Indonesia – artworks
- Onze-Lieve-Vrouwekathedraal (25 artworks) – Antwerp, Belgium – artworks
- Onze-Lieve-Vrouwekerk (2 artworks) – Bruges, Belgium – artworks
- Orange County Museum of Art (3 artworks) – Newport Beach, CA, USA – artworks
- Oratorio di San Giorgio (3 artworks) – Padova, Italy – artworks
- Oratorio di Villa Suardi (5 artworks) – Trescore, Italy – artworks
- Order of St. John Museum and Library (0 artworks) – London, UK
- Ordrupgaard Collection (5 artworks) – Copenhagen, Denmark – artworks
- Orlando Museum of Art (0 artworks) – Orlando, FL, USA
- Orsanmichele (3 artworks) – Florence, Italy – artworks
- Osaka Contemporary Art Center (0 artworks) – Osaka, Japan
- Osman Hamdi Bey Museum (2 artworks) – Gaziantep, Turkey – artworks
- Ospedale Santa Maria Nuova (1 artworks) – Florence, Italy – artworks
- Ossolinski National Institute (1 artworks) – Wroclaw, Poland – artworks
- Österreichische Galerie Belvedere (41 artworks) – Vienna, Austria – artworks
- Ottawa Art Gallery (0 artworks) – Ottawa, Canada
- Owens Art Gallery (0 artworks) – Sackville, Canada
