General Sir Warren Marmaduke Peacocke KCH CTSKC (21 September 1766–22 August 1849) was a British Army officer of the eighteenth and nineteenth centuries, most notable for his command of the Lisbon garrison during the Peninsular War. Peacocke joined the British Army in 1780, serving with a series of units before transferring to the Coldstream Guards in 1793. After having served as an aide de camp during the Irish Rebellion of 1798, Peacocke fought as a company commander with his regiment in the Egypt Campaign between 1800 and 1801, for which he was made a Knight of the Order of the Crescent by the Ottoman Empire. He subsequently served with the Coldstream Guards on the Hanover Expedition in 1805 and Copenhagen Expedition in 1807.