Jason D. Danieley (born July 13, 1971) is an American actor, singer, concert performer and recording artist.

[5] Danieley starred in the musical The Full Monty, which premiered at the Old Globe Theatre, San Diego, California in June to July 2000.

[8] Composer John Kander wrote the song "I Miss the Music" specifically for the character that Danieley played in Curtains.

[9] He played Lt. Joseph Cable, in the Emmy nominated concert version of South Pacific, performed at Carnegie Hall in June 2005.

[13] He appeared in the Williamstown Theatre Festival (Massachusetts) production of The Visit in July and August 2014, and again in 2015, when it transferred to Broadway.

[17] In 2022, Danieley starred as James Agee in the world premiere of Knoxville, a new musical written by Frank Galati with music by Stephen Flaherty and lyrics by Lynn Ahrens..[18][19][20] Danieley's career on and Off-Broadway combined with his classical background led to a natural crossover into singing with most of the country's leading symphonies and pops orchestras.

[22] Danieley met his wife, Marin Mazzie, in 1996 in an Off-Broadway play that they performed together titled Trojan Women: A Love Story.