Peter DeRose (or De Rose) (March 10, 1896 – April 23, 1953) was an American composer of jazz and pop music during the era of Tin Pan Alley.

A native of New York City, a son of Anthony and Armelina Agresti De Rose,[1] he showed a gift for all things musical at an early age.

His composition "When You're Gone, I Won't Forget" led to a job at the New York office of Italian music publisher G. Ricordi & Co.[2] In 1923, DeRose met May Singhi Breen when she performed on radio with the ukulele group The Syncopators.

"Deep Purple", DeRose's most famous song, was written in 1934 as a piano composition, with lyrics added a few years later by Mitchell Parish.

It was a hit for Larry Clinton & His Orchestra in 1939 and was recorded by Artie Shaw, Glenn Miller, Duke Ellington, and Sarah Vaughan.