Lieutenant-General Sir William Forbes Gatacre (3 December 1843 – 18 January 1906) was a British soldier who served between 1862 and 1904 in India and Africa.
He commanded the British Army Division at the Battle of Omdurman and the 3rd Division during the first months of the Second Boer War, during which time he suffered a humiliating defeat at the Battle of Stormberg.