Don Walsh

American oceanographer, explorer and marine policy specialist. He and Jacques Piccard were aboard the bathyscaphe Trieste when it made a record maximum descent into the Mariana Trench on 23 January 1960, the deepest point of the world's oceans. The depth was measured at 35,813 feet (10,916 m), but later and more accurate measurements have measured it at 35,798 feet (10,911 m).

Walsh lived with his wife, Joan, near Coquille, Oregon. He managed a marine consulting business beginning in 1976, and as of 2010 conducted about five deep-sea expeditions per year. In June 2020, Walsh's son Kelly dived to the bottom of the Challenger Deep with Vescovo, becoming the twelfth person to reach the deepest point in the ocean.

Don Walsh died in Oregon on 12 November 2023 at the age of 92.