  Mass calibration uncertainty is the largest systematic effect for using
clusters of galaxies to constrain cosmological parameters. We present weak
lensing mass measurements from the Canada-France-Hawaii Telescope Stripe 82
Survey for galaxy clusters selected through their high signal-to-noise thermal
Sunyaev-Zeldovich (tSZ) signal measured with the Atacama Cosmology Telescope
(ACT). For a sample of 9 ACT clusters with a tSZ signal-to-noise greater than
five the average weak lensing mass is
$\left(4.8\pm0.8\right)\,\times10^{14}\,\mathrm{M}_\odot$, consistent with the
tSZ mass estimate of $\left(4.70\pm1.0\right)\,\times10^{14}\,\mathrm{M}_\odot$
which assumes a universal pressure profile for the cluster gas. Our results are
consistent with previous weak-lensing measurements of tSZ-detected clusters
from the Planck satellite. When comparing our results, we estimate the
Eddington bias correction for the sample intersection of Planck and
weak-lensing clusters which was previously excluded.
