  BL Lac objects are the most numerous class of extragalactic TeV-detected
sources. One of the biggest difficulties in investigating their TeV emission
resides in their limited number, since only 47 BL Lacs are known as TeV
emitters. In this paper, we propose new criteria to select TeV BL Lac
candidates based on the infrared (IR) and X-ray observations. We apply our
selection criteria to the BL Lac objects listed in the ROMA-BZCAT catalog so
identifying 41 potential TeV emitters. We then consider a search over a more
extended sample combining the ROSAT bright source catalog and the WISE all-sky
survey revealing 54 additional candidates for TeV observations. Our
investigation also led to a tentative classification of 16 unidentified X-ray
sources as BL Lac candidates. This analysis provides new interesting BL Lac
targets for future observations with ground based Cherenkov telescopes.

High Energy Astrophysical Phenomena