Exploring the Planets: Neptune
- Information and photographs on the moons, atmosphere, and rings of planet Neptune
- http://www.nasm.si.edu/ceps/etp/neptune/

Encarta Encyclopedia: Neptune
- Information on the planet Neptune.
- http://encarta.msn.com/encyclopedia_761577112/Neptune_(planet).html

Windows to the Universe: Neptune
- Overview of several aspects of the planet. Versions available for beginner, intermediate and advanced level users.
- http://www.windows.ucar.edu/tour/link=/neptune/neptune.html

NSSDC Photo Gallery: Neptune
- Select images of the planet, with brief captions.
- http://nssdc.gsfc.nasa.gov/photo_gallery/photogallery-neptune.html

Neptune
- Pictures, statistics, and detailed information on planet Neptune.
- http://www.nineplanets.org/neptune.html

Astronomy 161: Neptune
- General features and some pictures.
- http://csep10.phys.utk.edu/astr161/lect/neptune/neptune.html

Mathematical Discovery of Neptune
- Another interesting history on how planets can be discovered mathematically.
- http://www-groups.dcs.st-and.ac.uk/~history/HistTopics/Neptune_and_Pluto.html

Views of the Solar System: Neptune
- Views, animations, general information and data of the planet.
- http://www.solarviews.com/eng/neptune.htm

Royal Greenwich Observatory: Neptune
- Basic overview.
- http://www.rog.nmm.ac.uk/leaflets/solar_system/section3.13.html

Welcome to the Planets: Neptune
- Planetary profile and vital statistics.
- http://pds.jpl.nasa.gov/planets/welcome/neptune.htm