  We present the results of searches for rare B meson decays. The measurements
use all or part of a data sample of about 88 million $\Upsilon(4S)\to B{\bar
B}$ decays collected between 1999 and 2002 with the \babar detector at the
PEP-II asymmetric energy B Factory at the Stanford Linear Accelerator Center.
We study a variety of decays dominated by electromagnetic, electroweak and
gluonic penguin transitions, and report measurements of branching fractions and
other quantities of interest.
