Horace Gundry Alexander (18 April 1889 – 30 September 1989) was a British Quaker teacher and writer, pacifist and ornithologist. He was the youngest of four sons of Joseph Gundry Alexander (1848–1918), two other sons being the ornithologists Wilfred Backhouse Alexander and Christopher James Alexander (1887–1917). He was a friend of Mahatma Gandhi.