We propose to complete our program of optical imaging of a sample of candidate strong-lensing galaxies discovered in the Herschel Multi-tiered Extragalactic Survey (HerMES) that was started in GS-2013B-Q-77 ( 80% complete). All of the targets in this proposal have exquisite, high-S/N and high-spatial resolution sub-mm imaging from ALMA that resolves the background source, and many of them have HST/F110W snapshot imaging that pinpoints the position of galaxies along the line of sight that act as gravitational lenses. The ALMA data will permit lens models that measure the mass of the foreground lens and the intrinsic luminosity and size of the background source. We propose to obtain deep (r=24 for a 5-sigma point-source) multi-band (ugriz) wide-field imaging of 7 targets that currently lack optical imaging in one or more optical bands. These data will identify the true optical counterparts to the ALMA sources, measuring their photometric redshifts, stellar masses, star-formation histories.