Time series BVI photometry is presented for 16 short-period variables located in the central region of the globular cluster NGC 6397 .
The sample includes 9 newly detected variables .
The light curve of cataclysmic variable CV6 shows variability with a period of 0.2356 days .
We confirm an earlier reported period of 0.472 days for cataclysmic variable CV1 .
Phased light curves of both CVs exhibit sine-like light curves , with two minima occurring during each orbital cycle .
The secondary component of CV1 has a low average density of 0.83 g cm ^ { -3 } indicating that it can not be a normal main sequence star .
Variables among the cluster blue stragglers include a likely detached eclipsing binary with orbital period of 0.787 days , three new SX Phe stars ( one of which has the extremely short period of 0.0215 days ) , and three low amplitude variables which are possible \gamma Doradus variables .