The Melodeon (1839 - ca.1870) was a concert hall and performance space in 19th-century Boston, Massachusetts, located on Washington Street, near West Street. Musical concerts, lectures, sermons, conferences, visual displays, and popular entertainments occurred there.
The Melodeon occupied the building of the former Lion Theatre (1836–1839) and Mechanics Institute (1839).
Proprietors of the Melodeon included the Handel and Haydn Society (1839); Leander Rodney (1844); Boston Theatre Company (1852); E. Warden (1857; temporarily renamed The Melodeon Varieties); Charles Francis Adams (1859).
Coordinates: 42°21′15.52″N 71°3′44.26″W / 42.3543111°N 71.0622944°W