Creative Commons Search Search for images across several open archives
WikiMedia Commons A repository for public domain and freely-licensed educational media content (images, sound and video clips).
Flickr: The Commons Access public photo collections from institutions worldwide.
Digital Public Library of America The Digital Public Library of America (DPLA) offers a single point of access to millions of items - photographs, manuscripts, books, sounds, moving images, and more - from libraries, archives, and museums around the United States.
Europeana Digital collections from Europe's galleries, libraries, archives and museums.
Google Image Search Choose one of the "Free to use" options under Usage Rights to find an array of rights-free or Creative Commons licenses.
Library of Congress American Memory Collections relating to American history and culture. Maps, advertising, images of significant events and places, etc.
Library of Congress Prints and Photographs Collection Online access to much of the Prints and Photographs Division's holdings, including architecture, design and engineering.
NYPL Digital Gallery Provides free and open access to over 700,000 images digitized from the The New York Public Library's vast collections. Low resolution images are for personal, educational & research purposes.
Getty Open Content The Getty makes available, without charge, all available digital images to which the Getty holds the rights or that are in the public domain to be used for any purpose. No permission is required.
British Museum Search almost two million objects in the British Museum collections.
Images from the History of Medicine (NLM) Comprising almost 70,000 images from the Prints and Photographs Collection as well as other collections held in the History of Medicine Division, IHM is one of the largest image databases in the world dedicated to images of medicine, dentistry, public health, the health professions, and health institutions.