The Habitable Worlds Observatory Preliminary Input Catalog (HPIC) is a list of approximately 13,000 nearby bright stars identified as potential targets for the Habitable Worlds Observatory (HWO) mission. The HPIC is constructed using data from the TESS and Gaia DR3 catalogs and an automated pipeline to compile stellar measurements and derived astrophysical properties. The catalog is benchmarked against the manually curated ExEP HWO Precursor Science Stars list, showing consistent stellar properties for the 164 best targets for exo-Earth direct imaging. The HPIC is useful for yield calculations to predict the science output of various mission designs, including those with larger telescope diameters and different planet types. The catalog's breadth and completeness are essential for accurate HWO mission trade studies and will also benefit other exoplanet studies and general astrophysics research on bright nearby stars. The HPIC is publicly available and serves as a preliminary input catalog for HWO, with future updates expected to improve the accuracy and completeness of stellar properties.The Habitable Worlds Observatory Preliminary Input Catalog (HPIC) is a list of approximately 13,000 nearby bright stars identified as potential targets for the Habitable Worlds Observatory (HWO) mission. The HPIC is constructed using data from the TESS and Gaia DR3 catalogs and an automated pipeline to compile stellar measurements and derived astrophysical properties. The catalog is benchmarked against the manually curated ExEP HWO Precursor Science Stars list, showing consistent stellar properties for the 164 best targets for exo-Earth direct imaging. The HPIC is useful for yield calculations to predict the science output of various mission designs, including those with larger telescope diameters and different planet types. The catalog's breadth and completeness are essential for accurate HWO mission trade studies and will also benefit other exoplanet studies and general astrophysics research on bright nearby stars. The HPIC is publicly available and serves as a preliminary input catalog for HWO, with future updates expected to improve the accuracy and completeness of stellar properties.