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Norman, M.D., 1992. Four new octopus species of the Octopus macropus group (Cephalopoda: Octopodidae) from the Great Barrier Reef, Australia. Memoirs of the Museum of Victoria 53: 267-308. Four new species of shallow-water octopuses are described from tropical waters of the Great Barrier Reef, Australia. All four are members of the "Octopus macropus group" (Robson. 1 929). characterised by arms of unequal length with the dorsal pair longest (AF 1 .2.3.4), moderate to high gill lamellae counts (10-14 per demibranch) and a robust conical copulatorv organ. All are nocturnally active. Two species. O. alpheus and O. aspilosomatis spp. nov occur in clear waters foraging predominantly on intcrtidal coral reefs and offshore islands. O. dierylhraeus sp. nov. forages intertidally and subtidally on muddy substrates in coastal waters. Octopus graptUS occurs in more open waters, on sandy and mud substrata in the channels and flat bottoms between islands. Full morphological descriptions arc provided, along with details of known distributions, life history and commercial exploitation. Delineation of each species from related taxa is discussed.