  We present a new catalogue of the RATAN-600 multi-frequency measurements for
BL Lac objects. The purpose of this catalogue is to compile the BL Lac
multi-frequency data that is acquired with the RATAN-600 simultaneously at
several frequencies. The BL Lac objects emit a strongly variable and polarized
non-thermal radiation across the entire electromagnetic spectrum from radio to
gamma-rays and represent about one percent of known AGNs. They belong to the
blazar population and differ from other blazars featureless optical spectrum,
which sometimes have absorption lines, or have weak and narrow emission lines.
One of the most effective ways of studying the physics of BL Lacs is the use of
simultaneous multi-frequency data. The multi-frequency broadband radio spectrum
was obtained simultaneously with an accuracy of up to 1-2 minutes for four to
six frequencies: 1.1, 2.3, 4.8, 7.7, 11.2, and 21.7 GHz. The catalogue is based
on the RATAN-600 observations and on the data from: equatorial coordinate and
redshift, R-band magnitude, synchrotron peak frequency, SED classes and object
type, literature. The present version of the catalogue contains RATAN-600 flux
densities measurements over nine years (2006-2014), radio spectra at different
epochs, and their parameters for more than 300 BL Lacs objects and candidates.
The BL Lacs list is constantly updated with new observational data of
RATAN-600.
