  We report the detection of a dwarf nova (DN) in the core region of the
globular cluster M55. Six outbursts were observed during 8 observing seasons
spanning the period 1997-2004. The variable has an X-ray counterpart detected
on images taken with the ROSAT telescope. Although we cannot offer proof of
cluster membership, one can see that both the position on the H-R diagram and
the X-ray flux are consistent with a bright DN at the cluster distance.
According to our outburst statistics, no more than one similar DN could remain
undetected in our field of view, centred at the cluster core.
