Many museums host their collections online, providing great quality images and information about the work. The following links are examples of such collections, although there are many more available.

The Courtauld Institute of Art: Art and Architecture

Courtauld's Art and Architecture website offers users more than 40,000 images in every discipline one could think of. The site is well organized and easy to navigate, with high quality images to choose from. Images acquired via the Art and Architecture web site are for non-commercial private or educational use only. Copyright information can be found here.

Fine Arts Museum of San Francisco

The Fine Arts Museum of San Francisco offers over 82,000 images to the public. Information on their copyright policy, including publishing permissions, are available here. The site features "My Gallery," which allows the user to create their own personal gallery from the images at the FAMSF, as well as search through the public galleries of other users. The Museum also offers advanced searching and browsing techniques.

The Getty , Los Angeles

Images available from the Getty may be browsed by artist, medium, and theme. The site also includes highlights of the collection, current and past exhibitions, and videos and podcasts. The Getty Research Institute has some of the strongest resources available for art education. Use of images falls under fair-use laws, as stated under numeral 2 here.

Metropolitan Museum of Art, New York

The Museum website offers an amazing variety of features, including a comprehensive timeline of art history, special artist features, and most importantly a database of their online collection. The Modern art section can be found here, while the C├ęzanne feature can be found here. The MoMa asks that the museum is cited when appropriate.
Designed by Travis and Brady Hammond using open source photo album software, Photomoma us a virtual museum consisting solely of photographs of works found within the MoMa. The focus is on the impression of visitors to the museum, and "for each item in MoMA's collection, Photomoma aims to have a website displaying photographs visitors to MoMA have taken of that item, capturing their own unique impression of the art MoMA has on display. The result will be a pastiche of images that will force the viewer to critique their own relationship to the artwork in the photographs. Furthermore, the viewer will have to question whether or not the photographs themselves are works of art. In this way, Photomoma is designed to educate viewers not only about the artwork in the photographs, but about art in general and the ways in which the Internet can change how we both see and perceive it."

Museum of Fine Arts, Boston

The Museum of Fine Arts has over 336,000 works available online for educational use. The images are searchable through numerous fields, and browsable mainly by provenance. The MFA also offers many reference tools to facilitate visual education.

National Gallery of Art, Washington, D.C.

Sophisticated searching and browsing features are some of the highlights of this site, which also include podcasts, slide shows, and other media rich features. Resources devoted to Modern and Contemporary painting and sculpture are found here. The National Gallery offers their online collection for personal, educational, and non-commercial uses only.

Smithsonian Institution, Washington, D.C.

The Smithsonian's Encyclopedia of Art and Design is one of the most extensive image resources online. To get started, users can either browse by category, which is organized alphabetically on the left side, or explore the different collections that are highlighted in the body of the page. To look or a specific item, the collections search tool can be found at the bottom of the left hand side. The Smithsonian invites visitors to use its online content for personal, educational and other non-commercial purposes. Copyright information.

Virtual Library Museums Page

Maintained by Johnathon Brown, this site is an enormous directory of international museums, galleries, and libraries. It also includes links to Wikis, discussion groups, professional associations, and all things museum related. One can either browse by country or search by museum.