  We present identification and astrometry of all previously known or suspected
variables along with the discovery of six new variables in the globular cluster
M3. The number of the catalogized variables increased to 274 by including all
the confirmed, previously known variables and the new discoveries. The precise
and homogeneous astrometry, as well as the clarification of misapprehensions in
the preceding identifications are done by using overlapping fields from a
wide-field Schmidt-camera, a 1m RCC telescope, and HST archive observations
from the center of the cluster. The astrometric positions can serve as a direct
input to any photometry which needs the accurate centers of the variables.
