  We report measurements of the $D^0, D^+$, and $D^+_s$ meson lifetimes using
$3.7 fb^{-1}$ of e^+e^- annihilation data collected near the $\Upsilon(4S)$
resonance with the CLEO detector. The lifetimes of the $D^0, D^+$, and $D^+_s$
mesons are measured to be $408.5 \pm 4.1 ^{+3.5}_{-3.4} fs, 1033.6 \pm 22.1
^{+9.9}_{-12.7} fs$, and $486.3 \pm 15.0 ^{+4.9}_{-5.1} fs$, respectively. The
precisions of the charm meson lifetimes reported here are comparable to those
of the best previous measurements, and the systematic errors are very
different. In a single experiment we find that the ratio of the $D^+_s$ and
$D^0$ lifetimes differs from one by more than 4.5 standard deviations.
