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The correlation between black hole mass M(BH) and stellar velocity dispersionsigma in nearby elliptical galaxies affords a novel way to determine M(BH) inactive galaxies. We report on measurements of sigma from optical spectra of 7BL Lac host galaxies. The derived values of sigma are in the range of 160 - 290km/s corresponding to M(BH) of 5 x 10^7 to 1 x 10^9 Msun. The average ratio ofM(BH) to the host galaxy mass is 1.4 x 10^-3, consistent with that estimated inother active and inactive galaxies. The velocity dispersions and the derivedvalues of M(BH) of the BL Lacs are similar to those obtained for low redshiftradio galaxies, in good agreement with the predictions of the unified modelsfor radio-loud active galaxies.Comment: 11 pages, Astrophysical Journal (Letters), accepte

The Black Hole Mass of BL Lacertae Objects from the Stellar Velocity Dispersion of the Host Galaxy