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The metallicities of 29 RR Lyrae variables and five red giants in the globular cluster M3 have been determined from moderate-resolution spectra taken with the Hydra multifiber spectrograph on the 3.5 m WIYN telescope. Color indices in the Gunn uvgri system taken on the Kitt Peak 0.9 m telescope were used in conjunction with synthetic colors to estimate the temperature and gravity of each star. We find similar metallicities for both the RR Lyrae variables and the giants after correcting for overionization of Fe I in the variables, and derive [m/Fe] ratios for Mg, Ca, Sc, and Ti. The metallicities derived for M3's RR Lyrae variables show no dependence on either temperature at minimum light or period.