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We present Ha fluxes and sizes for most of the H n regions in M33 listed in the catalog of Courtes et al. (1987, A&A, 174, 28). The observed bright end of the differential luminosity function is approximately a power law with exponent a = -2.40 ± 0.15, while the number counts turn over at an H a luminosity of approximately 10 36 4 erg s _ 1 . After accounting for the effects of incompleteness in our sample, we find that the faint end of the corrected luminosity function remains almost constantdoi:10.1086/133961 fatcat:mpc5eki6izdofle77vaelidzja