The Hopkins Ultraviolet Telescope HUT was a 0.9 meter telescope with a prime focus far-ultraviolet spectrograph that was used to observe the 912-1850 Å spectral region at a resolution of ~3  Å. HUT was built by scientists and engineers at the Johns Hopkins University and was one of three ultraviolet telescopes that flew twice on the space shuttle as a dedicated Spacelab astronomy payload. The Astro-1 mission flew on the space shuttle Columbia during 2-10 December 1990, and obtained 106 spectro-photometric observations of 77 targets. A few sources were also observed in the 415-912 Å region (2nd order) with 1.5 Å resolution. The Astro-2 mission flew on the space shuttle Endeavour from 3-17 March 1995, where HUT was used to obtain 385 observations of 265 targets. Because of upgrades to HUT between the missions, the instrument was approximately twice as sensitive during the Astro-2 mission.