iScienceProject

Science projects, contests and competitions using HOBO data loggers for teachers and their students in grades 5-12.
http://www.iscienceproject.com/

Intel International Science and Engineering Fair

ISEF provides worldwide competitive scholarships, tuition grants, internships, scientific field trips. Winner attends Nobel ceremony.
http://www.sciserv.org/isef/

Intel Science Talent Search

Formerly Westinghouse Science Talent Search. Continuously operated by Science Service, Inc.
http://www.sciserv.org/sts/

World-Wide Web Virtual Library: Science Fairs

International, national, regional, local and virtual science fairs.
http://physics.usc.edu/~gould/ScienceFairs/

Discovery Channel: Science Fair Central

Separate science fair guides for students, teachers, and parents.
http://school.discovery.com/sciencefaircentral/

Science Fair Videos

offering a number of science fair and invention videos for use at elementary, middle and high schools the site also provides a comprehensive list of science fair resources.
http://sciencevideos.com/products/fair/fair.html

Science Fair Projects

A list of science fair links, a review of science fair books, and some suggestions for science fair projects.
http://www.jimloy.com/science/sfair.htm

Science Competitions

NSTA position statement.
http://www.nsta.org/positionstatement&psid=3

Siemens Westinghouse Science and Technology Competition

National research competition in the sciences and mathematics for high school students. It awards one million dollars in scholarships, annually.
http://www.siemens-foundation.org/competition/

Science Olympiad

The official Web Site of The National Science Olympiad Committee. Contains the latest official information available.
http://www.soinc.org/