HD 93521 is a single, massive star in the northern constellation of Leo Minor. With an apparent visual magnitude of 7.03, it is too faint to be seen with the naked eye. The star is located at a distance of approximately 5.0 kilolight-years (1.52 kpc) from the Sun based on parallax measurements. It is positioned at a high galactic latitude of +62° and is located about 4.6 kilolight-years (1.4 kpc) above the Galactic plane. The brightness, position, and rapid rotation of this star makes it particularly suited to examining the interstellar gas in the Milky Way halo.