  We have conducted a three band (BVI) variability survey of the globular
cluster M3. This is the first three band survey of the cluster using modern
image subtraction techniques. Observations were made over 9 nights in 1998 on
the 1.2m telescope at the F.L. Whipple Observatory in Arizona. We present
photometry for 180 variable stars in the M3 field, of which 12 are newly
discovered. New discoveries include six SX Phe type variables which all lie in
the blue straggler region of the color magnitude diagram, two new first
overtone RR Lyrae, a candidate multi-mode RR Lyrae, a detached eclipsing
binary, and two unclassified variables. We also provide revised periods for 52
of the 168 previously known variables that we observe. The catalog and
photometry for the variable stars are available via anonymous ftp at
ftp://cfa-ftp.harvard.edu/pub/kstanek/M3/
