Royston Hulbert Nash (born July 23, 1933) is an English-born conductor, best known as a music director of the D'Oyly Carte Opera Company.
He began as a conductor with the Royal Marines from 1957 to 1970. He then joined D'Oyly Carte, becoming Music Director from 1971 to 1979. There, he led the company during its centenary year in 1975 and issued a number of recordings, including the company's only recordings of Utopia, Limited, The Grand Duke, and The Zoo, as well as recordings of some rarely heard Sullivan music. He then moved to the United States, where he became musical director of the Nashua Symphony Orchestra and the Cape Cod Symphony Orchestra until his retirement in 2007. He also founded and conducted Symphony by the Sea. He still resides in the United States.