Alick Donald Walker (26 October 1925 – 4 December 1999) was a British palaeontologist, after whom the Alwalkeria genus of dinosaur is named.
On graduation, he joined the research group of Professor Stanley Westoll at the University of Newcastle upon Tyne, working on the fossil reptiles of the Late Triassic found in Elgin.
The bony remains of the Elgin reptile fossils were poor, sometimes just indentations in rocks.
Walker devised a new casting method to capture the anatomical information in these fossils, using PVC; many of the resulting casts are now in the National Museum of Scotland and the Natural History Museum.
His early work was also notable for reclassifying and naming the English theropod dinosaurs Eustreptospondylus and Metriacanthosaurus.