The gamma spectra of 32 samples of 25 chondrites, 4 carbonaceous chondrites, and 9 achondrites were investigated using a large NaI (Tl) scintillation spectrometer. Potassium and Al were the predominant radioactivities measured. More unusual gamma emitters measured were 291-day Mn/ sup 54/, 2.6-year Na/sup 22/, and probably a mixture of Sc/sup 46/ and Co/sup 56+58/ (half lives approximately 80 days); these nuclides were detected in relatively recent falls (the youngest, the Harleton, Texas, chondrite, was measured 21 days after fall). Furthermore, thorium was detected and measured in 5 of the 9 achondrites. Of the 6 siderites studied, only Aroos and Siknote-Alin showed detectable gamma radioactivity. In Aroos, measured 120 days after fall, Mn/sup 54/ was the predominant radioactivity; Co/sup 60/ was the only radioactivity measured in the 4 samples of Siknote-Alin. In the other 4 old siderites, with a limit of detection of about 10 gammas/min/kg, no gamma-ray activity in the energy range 0.2 to 2 Mev was detectable. Quantitative data on radioactive concentration are presented. (auth)