Sir Graham Davies Speight (21 July 1921 – 17 July 2008) was a New Zealand High Court judge. He served as the acting Queen's Representative in the Cook Islands in 1984. Speight was born in Auckland on 21 July 1921. He was educated at Newmarket School, Auckland Grammar School and Auckland University College, where he earned his law degree in 1942. After graduating, he served in the New Zealand Army from 1942 until 1946. He married Elizabeth Muriel Booth in 1947, and the couple went on to have two children.