HST WFPC2 images of three radio‐selected BL Lac objects (central ﹩300\times 300﹩ pixels, or 13﹩\farcs﹩﹩80\times 13﹩﹩\farcs﹩80, of the PC). The top panel is the summed data (including point source). In the lower panel, the best‐fit PSF has been subtracted; residual structure in the center is due to imperfect knowledge of the PSF. Host galaxies are detected in 0828+493 (﹩z=0.548﹩) and 1538+149 (﹩z=0.605﹩) but not in 1308+326 (﹩z=0.997﹩). North is indicated by the arrow, and east by the bar; the length of the arrow is 2﹩\farcs﹩67, which corresponds to a physical length of 22.6 kpc for 0828+493, 29.0 kpc for 1308+326, and 21.4 kpc for 1538+149.