Jack Segal (October 19, 1918 – February 10, 2005) was a pianist and composer of popular American songs, known for writing the lyrics to Scarlet Ribbons. His composition May I Come In? was the title track for a Blossom Dearie album. Other songs he authored or co-authored are When Sunny Gets Blue, That's the Kind of Girl I Dream Of, I Keep Going Back to Joe's (with Marvin Fisher), A Boy from Texas, a Girl from Tennessee (with John Benson Brooks & Joseph Allan McCarthy), After Me (with Blossom Dearie) and When Joanna Loved Me (with Robert Wells). It has been estimated that his songs have helped sell 65 million records.

Lyrics for the ballad that was perhaps Segal's greatest hit, Scarlet Ribbons (with music composed by Evelyn Danzig Levine), were written in just 15 minutes in 1949, and the song was recorded that year by Jo Stafford. Recordings by Juanita Hall and Dinah Shore soon followed, but the song was largely ignored by the public until 1956, when a 1952 recording by Harry Belafonte's became suddenly popular in the wake of Belafonte's breakthrough calypso hits. At least 30 other artists have also recorded Scarlet Ribbons, including the Kingston Trio, Joan Baez, Sinéad O'Connor, the Lennon Sisters, Wayne Newton, Perry Como, and Dinah Shore.

His music was also featured in movie and television soundtracks such as Star Trek: Deep Space Nine.

In addition to the artists already mentioned, his songs have been recorded by Frank Sinatra, Frankie Laine, Cher, Barbra Streisand, Tony Bennett, Nancy Wilson, Rosemary Clooney, Al Jarreau and Nat King Cole.