Happy Birthday: Neil Leslie Diamond (born January 24, 1941) is an American singer-songwriter. He has sold more than 56.5 million records in the US alone, making him one of the best-selling musicians in history.

Diamond has written and recorded ten singles that reached No. 1 on the U.S. Billboard Hot 100 and Adult Contemporary charts: "Cracklin' Rosie", "Song Sung Blue", "Longfellow Serenade", "I've Been This Way Before", "If You Know What I Mean", "Desirée", "You Don't Bring Me Flowers" (which he co-wrote with Marilyn Bergman and performed with Barbra Streisand), "America", "Yesterday's Songs", and "Heartlight (co-written with Carole Bayer Sager and Burt Bacharach). Thirty-eight songs by Diamond have reached the top 10 on the Billboard Adult Contemporary chart, including "Sweet Caroline". He has also acted in films, making his screen debut in the 1980 musical drama film The Jazz Singer.

Diamond was inducted into the Songwriters Hall of Fame in 1984 and into the Rock and Roll Hall of Fame in 2011. He received a Sammy Cahn Lifetime Achievement Award in 2000. In 2011, he was an honoree at the Kennedy Center Honors, and he received the Grammy Lifetime Achievement Award in 2018.