Walter Morse Rummel (July 19, 1887 – May 2, 1953) was a prominent pianist, especially associated with Claude Debussy's works, as well as a composer and music editor.
His father was from a prominent family of German musicians, and his mother was a daughter of telegraph inventor Samuel Morse.
He studied piano with Leopold Godowsky and composition with Hugo Kaun, before moving to Paris in 1908.
On his way to Paris he met Ignacy Jan Paderewski in Switzerland, who called some of his piano compositions "not far from masterpieces" and invited him to stay for a year as a pupil; Rummel however turned down the invitation and continued to Paris.
In addition to his own performances and compositions, Rummel had an interest in preserving and arranging earlier music.