Adam Guettel (; born December 16, 1964) is an American composer-lyricist of musical theater and opera. Guettel has written the Broadway musicals Floyd Collins (1994), The Light in the Piazza (2003), and Days of Wine and Roses (2023). As a composer and lyricist, Guettel has earned acclaim and numerous accolades, including two Tony Awards, two Drama Desk Awards, The Stephen Sondheim Award, the Richard Rodgers Award, and the Frederick Loewe Award.