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We present a collection of 991 heartbeat star (HBS) candidates found in theOptical Gravitational Lensing Experiment (OGLE) project data archive. Wediscuss the selection process of the HBS candidates and the structure of thecatalog itself. It consists of 512 stars located toward the Galactic bulge(GB), 439 stars located in the Large Magellanic Cloud (LMC), and 40 in theSmall Magellanic Cloud (SMC). The collection contains two large groups of HBSswith different physical properties. The main distinction between the two groupsis the evolutionary status of the primary star. The first group of about 100systems contains a hot main-sequence (MS) or a Hertzsprung-gap primary star,while the second group of about 900 systems includes a red giant (RG). For eachstar, we provide two-decade-long time-series photometry, in the Cousins $I$-and Johnson $V$-band filters, obtained by the OGLE project. We also presentbasic observational information as well as orbital parameters derived from thelight curve modeling.

The OGLE Collection of Variable Stars. One Thousand Heartbeat Stars in the Galactic Bulge and Magellanic Clouds