Moe Jaffe (October 23, 1901 – December 2, 1972) was an American songwriter and bandleader, renowned for composing over 250 songs. Born in Vilna, Russian Empire (now Vilnius, Lithuania), Jaffe emigrated to the United States shortly after his birth, settling in Keyport, New Jersey. He graduated from Keyport High School and worked his way through the University of Pennsylvania's Wharton School and Law School by playing piano and leading a campus dance band, Jaffe's Collegians.

Jaffe's first major success came with the song "Collegiate," co-written with Nat Bonx, which became a quintessential flapper anthem and was featured in several Marx Brothers films. His career flourished in the late 1920s through the mid-1940s, with his orchestra becoming a Philadelphia favorite, and he contributed to Broadway musicals like "A Night in Venice" and "A Wonderful Night."

Joining ASCAP in 1929, Jaffe collaborated with numerous musicians, including Clay Boland and Fred Waring. Some of his most famous compositions include "The Gypsy in My Soul," "If I Had My Life to Live Over," "Bell Bottom Trousers," and "I'm My Own Grandpa." His work was recorded by legendary artists such as Frank Sinatra and Ella Fitzgerald, solidifying his legacy in American music history.