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We present a collection of 10 111 genuine delta Sct-type pulsating variablestars detected in the OGLE-IV Galactic bulge fields. In this sample, 9835variables are new discoveries. For most of the stars photometric data cover thewhole decade 2010-2019. We illustrate a huge variety of light curve shapes ofdelta Sct variables. Long-term observations have allowed us to spot objectswith evident period, amplitude, and mean brightness variations. Our analysisindicates that about 28% of the stars are single-mode pulsators. Fourteen deltaSct stars show additional eclipsing or ellipsoidal binary modulation. We reportsignificant attenuation or even disappearance of the pulsation signal in sixsources. The whole set of variables is a mix of objects representing variousMilky Way's populations, with the majority of stars from the Galactic bulge.There are also representatives of the Sagittarius Dwarf Spheroidal Galaxy. Someof the newly detected variables could be SX Phe-type stars residing in globularclusters. The collection, including full V- and I-band time-series data, isavailable to the astronomical community from the OGLE On-line Data Archive.

Over 10 000 Delta Scuti Stars toward the Galactic Bulge from OGLE-IV