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We calculate stellar masses for massive luminous galaxies at redshift 0.2-0.7using the first two years of data from the Baryon Oscillation SpectroscopicSurvey (BOSS). Stellar masses are obtained by fitting model spectral energydistributions to u,g,r,i,z magnitudes, and simulations with mock galaxies areused to understand how well the templates recover the stellar mass. AccurateBOSS spectroscopic redshifts are used to constrain the fits. We find that thedistribution of stellar masses in BOSS is narrow (Delta log M~0.5 dex) andpeaks at about logM ~ 11.3 (for a Kroupa initial stellar mass function), andthat the mass sampling is uniform over the redshift range 0.2 to 0.6, inagreement with the intended BOSS target selection. The galaxy masses probed byBOSS extend over ~10^{12} M, providing unprecedented measurements of thehigh-mass end of the galaxy mass function. We find that the galaxy numberdensity above ~ 2.5 10^{11} M agrees with previous determinations. We perform acomparison with semi-analytic galaxy formation models tailored to the BOSStarget selection and volume, in order to contain incompleteness. The abundanceof massive galaxies in the models compare fairly well with the BOSS data, butthe models lack galaxies at the massive end. Moreover, no evolution withredshift is detected from ~0.6 to 0.4 in the data, whereas the abundance ofmassive galaxies in the models increases to redshift zero. Additionally, BOSSdata display colour-magnitude (mass) relations similar to those found in thelocal Universe, where the most massive galaxies are the reddest. On the otherhand, the model colours do not display a dependence on stellar mass, span anarrower range and are typically bluer than the observations. We argue that thelack of a colour-mass relation for massive galaxies in the models is mostly dueto metallicity, which is too low in the models.

Stellar masses of SDSS-III BOSS galaxies at z~0.5 and constraints to galaxy formation models