Robert Orlando Morgan (1865 – 16 May 1956) was an English music teacher, composer and musicologist. He is best remembered as an influential teacher at the Guildhall School of Music in London, where he taught for 64 years, from 1887 to 1951, as Professor of Pianoforte and Composition. His pupils included the composer Benjamin Frankel and the pianist Dame Myra Hess. In 1910 Morgan composed many songs and classical pieces, as well as the music for the last Savoy opera, Two Merry Monarchs. It had poor notices and a brief run. Morgan wrote no more operas, but continued to compose prolifically throughout his life.