Europeana
30 Million items from a range of Europe's galleries, archives, libraries and museums.

Flickr Commons
Flickr provides a search specifically designed to locate works that are offered under the Creative Commons license.

Search.creativecommons.org
Offers convenient access to search services provided by other independent organizations. Note that selecting different search options within the result list—particularly Image search for Google and Yahoo—may lead to the inclusion of results which are not Creative Commons licensed.

Wikimedia Commons
Associated with the Wikipedia, Wikimedia Commons searches the images available in the online Wikipedia encyclopedia. Click on an image to view copyright restrictions.

National Marine Sanctuaries Gallery
Photos and videos from the National Oceanographic and Atmospheric Administration's Office of National Marine Sanctuaries.

Smithsonian Libraries Image Gallery
A selection of book illustrations, photos, drawings, and other images from across the Smithsonian Libraries.

Digital Collections at St. Lawrence University
A set of digital collections containing images from items in the University's Special Collections, the Richard F. Brush Art Gallery, along with faculty and student scholarship.
NOAA Photo Library
The NOAA Photo Library collections reflect NOAA’s broad mission of advancing science “from the bottom of the ocean to the surface of the Sun.” Images within the NOAA Photo Library are contributed by NOAA staff and help depict NOAA’s work to explain and interpret our changing environment. The collection includes thousands of weather and space images, hundreds of images of shores and coastal seas, and thousands of marine species images ranging from whales to the most minute plankton.

NREL Image Gallery
This Image Gallery, provided by the National Renewable Energy Laboratory (NREL), is a collection of more than 30,000 photographs, scientific images, and videos related to renewable energy and energy efficiency technologies, along with photos and videos documenting life at the laboratory. NREL is the U.S. Department of Energy's primary national laboratory for renewable energy and energy efficiency research and development.

NASA Earth Observatory Images
The Earth Observatory’s mission is to share with the public the images, stories, and discoveries about the environment, Earth systems, and climate that emerge from NASA research, including its satellite missions, in-the-field research, and models.
Most materials published on the Earth Observatory, including images, are freely available for re-publication or re-use, including commercial purposes, except for where copyright is indicated. In those cases you must obtain the copyright holder’s permission; we usually provide links to the organization that holds the copyright.