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The tenth part of the OGLE-III Catalog of Variable Stars contains 125 DoublePeriodic Variables (DPVs) from the Large Magellanic Cloud. DPVs aresemi-detached binaries which show additional variability with a period around33 times longer than the orbital period. The cause of this long cycle is notknown and previous studies suggest it involves circumbinary matter. We discussthe properties of the whole sample of the LMC DPVs and put more attention toparticularly interesting objects which may be crucial for verifying hypothesisexplaining long cycle variability. Secondary eclipses of one of the objectsdisappear during some orbital cycles and primary eclipses are deeper duringlong cycle minimum.

The Optical Gravitational Lensing Experiment. The OGLE-III Catalog of  Variable Stars. X. Enigmatic Class of Double Periodic Variables in the Large  Magellanic Cloud