Vice-Admiral Sir William Augustus Montagu KCH CB (4 December 1785 – 6 March 1852) was a senior officer of the British Royal Navy during the French Revolutionary and Napoleonic Wars who served in a number of sea battles and was also in command of the naval brigade in the brief land campaign to capture Île de France in 1810. During his service he was present at the capture of numerous French frigates and later served in the War of 1812. After the end of the Napoleonic Wars he remained in service and commanded several ships in the Mediterranean before he retired from active service in 1837. He remained a commissioned officer and later rose through the ranks to become a vice-admiral. For his services he was knighted in the Royal Guelphic Order and made a Companion of the Order of the Bath.