Cockatoo Valley is a settlement in South Australia. At the 2006 census, Cockatoo Valley had a population of 479.
It was first discovered and named by Europeans on 3 March 1838 when an exploration party of four young horsemen comprising John Hill, William Wood, Charles Willis, and John Oakden camped there on the first overland expedition from Adelaide to reach the River Murray at present Morgan. Oakden reported that the valley was 'swarming with cockatoos, seven of which were shot' to roast for supper. They encamped there at 'a rivulet' they had discovered, later named Yettie Creek.