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We present a collection of 65,981 Mira-type variable stars found in theOptical Gravitational Lensing Experiment (OGLE) project database. Two-thirds ofour sample (40,356 objects) are located in the Galactic bulge fields, whereas25,625 stars are in the Galactic disk. The vast majority of the collection(47,532 objects) are new discoveries. We provide basic observational parametersof the Mira variables: equatorial coordinates, pulsation periods, $I$-band and$V$-band mean magnitudes, $I$-band brightness amplitudes, and identificationsin other catalogs of variable stars. We also provide the $I$-band and $V$-bandtime-series photometry collected since 1997 during the OGLE-II, OGLE-III, andOGLE-IV phases. The classical selection process, i.e., mostly based on thevisual inspection of light curves by experienced astronomers, led us to thehigh purity of the catalog. As a result, this collection can be used as atraining set in the machine learning classification algorithms. Usingoverlapping parts of adjacent OGLE fields, we estimate the completeness of thecatalog to be about 96%. We compare and discuss the statistical features ofMiras located in different regions of the Milky Way. We show examples of starsthat change their type over time, from a semi-regular variable to Mira and viceversa. This dataset is perfectly suited to study the three-dimensionalstructure of the Milky Way, and it may help to explain the puzzle of theX-shaped bulge.

The OGLE Collection of Variable Stars. Nearly 66,000 Mira stars in the Milky Way