• NCG = Ny Carlsberg Glyptotek (Copenhagen)
• NG = National Gallery (London)
• NGA = National Gallery of Art (Washington)
• NGC = National Gallery of Canada (Ottawa)
• NGI = National Gallery of Ireland (Dublin)
• NGO = Nationalgalleriet (Oslo)
• NGP = Národní Galerie v Praze (Prague)
• NGP = National Gallery in Prague (Prague)
• NGS = National Galleries of Scotland (Edinburgh)
• NGV = National Gallery of Victoria (Melbourne)
• NLM = National Library of Medicine (Bethesda)
• NMS = National Museum of Serbia (Belgrade)
• NMSE = Nationalmuseum (Stockholm)
• NMW = National Museum Wales (Cardiff)
• NMWA = National Museum of Women in the Arts (Washington)
• NMWAJ = National Museum of Western Art (Tokyo)
• NNG = Neue Nationalgalerie (Berlin)
• NOMA = New Orleans Museum of Art (New Orleans)
• Norton Simon = Norton Simon Museum (Pasadena)
• NPG = National Portrait Gallery (London)
• NPM = Neue Pinakothek (Munich)
• NT = National Trust (UK)