Leopold "Leo" Smit (14 May 1900 – 30 April 1943) was a Dutch composer, murdered during The Holocaust at the Sobibor extermination camp.

In 1927 he moved to Paris, where the music of Maurice Ravel and Igor Stravinsky made a deep impression on him.

Here he was in close contact with the group of composers known as Les Six, which included Darius Milhaud, Arthur Honegger, and Francis Poulenc.

In late 1937, he returned to Amsterdam, where he completed his last work, the sonata for flute and piano, on February 12, 1943.

A 4-CD box set containing his complete works, Kamermuziek en Orkestwerken (NM 93003) has been issued.