  We present the result of BVI photometry, obtained by using FORS@VLT, of the
Cepheids present in the field of the Large Magellanic Cloud cluster NGC 1866.
We found the 22 known variables plus an additional new Cepheid located about
10' from the cluster center. The accuracy of the photometry allowed us to
derive B, V and I mean magnitudes with an uncertainty lower than 0.02 mag for
22 out of the 23 objects, with the exception of only one Cepheid (WS9) which
presents a noisy light curve due to the probable occurrence of image blending.
As a result, we provide accurate observational data for a substantial sample of
variables all lying at the same distance and with a common original
composition. The resulting period-luminosity relations are presented and
briefly discussed.
