You can use (free) images from Wikipedia on your own site, or anywhere you like.
You can use images that are freely-licensed images, provided you comply with the individual image’s license terms.
While all article text is licensed under the GFDL, free images have several free content licenses to choose from.
Are Wikimedia images public domain?
Almost all images and other media on Wikimedia Commons are under some kind of free license (usually CC-BY, CC-BY-SA, or GFDL; see Commons:Licensing) or in the public domain. Each media file has its licensing specified on its file description page.
Do you have to cite Wikipedia images?
Presently, images displayed in Wikipedia articles are, as a practice, not cited in the article itself. Wikipedia:Citing sources notes that “For an image or other media file, details of its origin and copyright status should appear on its file page.”
Does Wikipedia have copyright?
Yes. Wikipedia articles are copyrighted by their authors. However, all Wikipedia text is freely licensed under the Creative Commons Attribution-ShareAlike License (CC-BY-SA), meaning that so long as you meet the license conditions, you have permission to use the content—even commercially!
Can I use a public domain image?
A public domain image is defined as a photo, clip art or vector whose copyright has expired or never existed in the first place. These images can be used by almost anyone for personal and commercial purposes. There are three ways that public domain images occur: The image is not copyrightable.