National Association of Rocketry

NAR is the largest and oldest of the amateur rocketry associations was founded in 1957. Its provides numerous services to the amateur rocketry community including organizing sport events (launching for fun) and competitions (e.g. highest, longest flight, most realistic,etc), issue high-power certifications, sell liability insurance for rocket meets, and more. The web site provides lots rocket educational pages such as a nice introductory overview. The Technical Services section (NARTS) provides model rocket design plans, books, software, etc. They also have an extensive catalog with items for sell that include books, reports, paraphernalia, posters, scale data, rocket plans, software, etc.

Tripoli Rocketry Association One of the largest organizations devoted to high-powered rocketry. Provides user certifications, sponsors rocketry meets such as the national LDRS event, publishes the Rockets Magazine, etc.

Independent Association of Rocketry IAR is an organization of non-professional rocketeers to promote all levels of rocketry from low-power to high-power. Founded in 1995.