Brigadier-General William Garnett Braithwaite CB, CMG, DSO (21 October 1870–15 October 1937) was a British Army officer who participated in the Boer War and the First World War. He was seconded to the New Zealand Military Forces from 1911 to 1917. He commanded the New Zealand Division's 2nd Infantry Brigade for nearly two years on the Western Front and had periods as acting commander of the division. In December 1917, he was medically evacuated to England. After a period of rest, he returned to military duty with the British Army, and ended the war in command of the 16th Infantry Brigade. Retiring from the army in 1925, he died in 1937.