| Alfred Cockayne | |
| Birth Date: | 23 May 1880 |
| Birth Place: | Oamaru or Dunedin, New Zealand |
| Death Place: | Waikanae, New Zealand |
| Relatives: | Leonard Cockayne (father) |
Alfred Hyde Cockayne (23 May 1880 – 21 October 1966) was a New Zealand botanist, agricultural scientist and administrator. He was born in Dunedin, or Oamaru, New Zealand, on 23 May 1880. He was the son of another noted botanist Leonard Cockayne.
In the 1937 Coronation Honours, Cockayne was made a Companion of the Imperial Service Order. In the 1957 Queen's Birthday Honours, he was appointed a Commander of the Order of the British Empire, for services to agriculture.