Fantastic Duo (Korean: 판타스틱 듀오) is a South Korean television show where fans can sing a duet with their favorite singer using their cell phones. This show is currently hosted by Jun Hyun-moo, Kim Bum-soo and Kim Jun-hyun. It airs on SBS every Sunday at 16:50 (KST) beginning April 17, 2016; forming part of SBS's Good Sunday lineup. There were 30 episodes aired during Season 1, which ended on November 20, 2016.

Season 2 broadcast every Sundays at 18:30 (KST) starting March 26, 2017, after Running Man. On October 26, Fantastic Duo production team announced that season 2 would be end after the last recording on November 7, whose the last regular episode was aired on December 10. A special episode titled "Fantastic Memory" was aired on December 17, 2017.