Sir Nathaniel Barnaby, KCB (25 February 1829 – 16 June 1915) was Chief Constructor of the Royal Navy from 1872 to 1885.

He was invited to join the Department of Naval Construction in 1854 to take part in designing the first British ironclad warship, HMS Warrior.

When Reed retired in 1872, Barnaby was elevated to "President of the Council of Construction and Chief Naval Architect."

During his thirteen years in office, he faced possibly more and various changes in ship design than any Director of Naval Construction before or since.

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