Hello, Dolly! is a 1964 musical with lyrics and music by Jerry Herman and a book by Michael Stewart, based on Thornton Wilder's 1938 farce The Merchant of Yonkers, which Wilder revised and retitled The Matchmaker in 1955. The musical follows the story of Dolly Gallagher Levi, a strong-willed matchmaker, as she travels to Yonkers, New York, to find a match for the miserly "well-known unmarried half-a-millionaire" Horace Vandergelder.

Hello, Dolly! debuted at the Fisher Theater in Detroit on November 18, 1963, directed and choreographed by Gower Champion and produced by David Merrick, and moved to Broadway in 1964, winning 10 Tony Awards, including Best Musical. These awards set a record which the play held for 37 years. The show album Hello, Dolly! An Original Cast Recording was inducted into the Grammy Hall of Fame in 2002. The album reached number one on the Billboard album chart on June 6, 1964, and was replaced the next week by Louis Armstrong's album Hello, Dolly! Louis Armstrong also was featured in the film version of the show, performing a small part of the song "Hello, Dolly!".

The show has become one of the most enduring musical theater hits, with four Broadway revivals and international success. It was also made into the 1969 film Hello Dolly! by 20th Century Fox, which won three Academy Awards, including Best Score of a Musical Picture and was nominated in four other categories, including Best Picture at the 42nd Academy Awards.