William Henry Smyth (1788-1865) was an English sailor and astronomer. He joined the Royal Navy and during the Napoleonic wars he served in the Mediterranean, eventually achieving the rank of Admiral. During a hydrographic survey in 1817 he met the Italian astronomer Giuseppe Piazzi in Palermo, Sicily, and visited his observatory; this sparked his interest in astronomy and in 1825 he retired from the Navy to establish a private observatory in Bedford, England, equipped with a 5.9-inch refractor telescope. He used this instrument to observe a variety of deep sky objects over the course of the 1830s, including double stars, star clusters and nebulae. He published his observations in 1844 in the Cycle of Celestial Objects, which earned him the Gold Medal of the Royal Astronomical Society in 1845 and also the presidency of the society. The first volume of this work was on general astronomy, but the second volume became known as the Bedford Catalogue and contained Smyth's observations of 1,604 double stars and nebulae. His other works include: Aedes Hartwellianae (1851), Speculum Hartiwellianum (1860), Sidereal Chromatics (1864) and The Sailor's Word-Book (1867).