Copyright Notice: Before using any images from this list please check copyright statement on the site. The majority of the sites listed below allow the use of their material for educational, noncommercial or personal use as long as the source is acknowledged.
U.S. Government Graphics and Photos – National, digital library contains free, high quality digital materials, organized by governmental department.
Pics4Learning – Pics4Learning is a copyright-friendly image library for teachers and students. The Pics4Learning collection consists of thousands of images that have been donated by students, teachers, and amateur photographers.
PD Photo – Thousands of high quality royalty free, public domain photos
US Department of Agriculture Research Service Image Gallery – Contains high and low resolution images of animals and plants
Free Foto – The largest Internet collection of free photographs for private, non-commercial use
Free Photo 1 – Collection of more than 650 photos for free download