Dudley Walker Morton (July 17, 1907 – October 11, 1943), nicknamed "Mushmouth" or "Mush", was a submarine commander of the United States Navy during World War II.

There he received the nickname "Mushmouth", after a character in the cartoon strip Moon Mullins whose large square jaw and prominent mouth resembled Morton's.

During Wahoo's third war patrol, Morton was responsible for an incident which resulted in shipwrecked soldiers in about twenty lifeboats of sunken Japanese transport Buyo Maru being fired on while in the water.

[9] Vice Admiral Charles A. Lockwood, the Commander of the Submarine Force for the U.S. Pacific Fleet (COMSUBPAC) asserted that the survivors were army troops and turned machinegun and rifle fire on Wahoo while she maneuvered on the surface.

After the war, it was determined from Japanese records that, on October 11, in the time frame in which the Wahoo was expected to exit through La Pérouse Strait, an antisubmarine aircraft found a surfaced submarine and attacked, dropping three depth charges.

Added Lockwood: "Morton lined up an impressive number of 'firsts' during the short ten months that he commanded Wahoo: first to penetrate an enemy harbor and sink a ship therein; first to use successfully a down the throat shot; and first to wipe out an entire convoy single-handed."

In Herman Wouk's novel War and Remembrance, and the mini-series based on it, the Buyo Maru incident is prominently fictionalized as a scene for a major character's development.