  We present the first results from our on-going program to estimate black hole
masses [M(BH)] of nearby BL Lac objects. The estimates are based on stellar
velocity dispersion (sigma) of the BL Lac host galaxies from optical
spectroscopy, and the recently found tight correlation between M{BH} and sigma
in nearby early-type galaxies. For the first three BL Lacs, we find log M(BH) =
7.5 - 8.7 and M(BH)/M(host) = 0.03 - 0.1.
