Captain John Conn (c. 5 August 1764 – 4 May 1810) was a senior captain in the Royal Navy, whose career, which included service at the battles of the Saintes, the Glorious First of June, Copenhagen and Trafalgar, ended in a shipboard accident before he could reap the rewards of his long service. Conn could also claim membership of Nelson's "Band of Brothers", a clique of dashing naval officers who participated in Nelson's campaigns during the French Revolutionary and Napoleonic Wars, as well as a close friendship with the admiral himself, who once said: "A better or more zealous officer than Captain Conn is not in His Majesty's service."