Rear Admiral Joseph Ballard Murdock (13 February 1851 – 20 March 1931), sometimes spelled Murdoch, was an officer in the United States Navy. He fought in the Spanish-American War, was Commander-in-Chief of the United States Asiatic Fleet, and came out of retirement to serve during World War I. In retirement, he was a member of the New Hampshire House of Representatives. He also was an author of books on naval and scientific subjects.