  Based on new CCD photometry and spectroscopy we confirm the presence of two
cataclysmic variables (CVs) in the very old open cluster NGC 6791. One of these
variables, known as B8, was observed by Rucinski, Kaluzny & Hilditch (1996) to
undergo a large magnitude outburst in 1995. The spectrum of this star outside
the outburst, obtained by us with MMT, shows clearly the emission lines
characteristic for dwarf novae. We observed the second star, known as B7, to
undergo large ($\sim3 mag$) drop in its brightness over $\sim 10 days$. The
spectrum of B7 obtained in the high state resembles spectra of nova-like CVs.
This star a likely member of UX~UMa subtype of CVs. Variables B7 and B8
represent only the second and the third cataclysmic variables known in open
clusters. Variable B7 has observational characteristics which would make it
difficult to identify as a CV with some of the methods being currently used in
surveys for CVs in globular clusters.
