Leonid Hambro (June 26, 1920 – October 23, 2006) was an American concert pianist and composer.

Hambro was born in Chicago, the son of immigrant Lithuanian Jews; his father was a pianist accompanying silent films.

Hambro was Artist in Residence of the Aspen Institute and the official pianist of radio WQXR, New York.

He also composed the piano piece Happy Birthday Dear Ludwig, a set of five variations on "Happy Birthday to You" in the style of many famous Beethoven pieces such as Minuet in G, Sonata Pathétique, Moonlight Sonata, Für Elise, and the Fifth Symphony.

With Victor Borge Hambro played persiflages on well-known pianopieces like Chopins Minute Waltz.