The Emerson Tower is a 15-story, 88 m (289 ft) clock tower erected in 1907–1911 at 21 South Eutaw Street, at the northeast corner of Eutaw and West Lombard Streets in downtown Baltimore, Maryland. It was the tallest building in the city from 1911 to 1923, until supplanted by the Citizens National Bank building at the southeast corner of Light and Redwood (German) Streets. It was designed by local architect Joseph Evans Sperry (1854-1930) for Isaac Edward Emerson (1859-1931), who invented the Bromo-Seltzer headache remedy.

Captain Isaac Edward Emerson (1859–1931) was a wealthy American businessman, socialite, and seaman. He is most notable for having created the headache remedy Bromo-Seltzer upon which his great wealth was based and the reason he was known as the "Bromo-Seltzer King".