Auchinleck is a parish, which lies in East Ayrshire Council Area, some 4 miles (7 km) east of Cumnock in East Ayrshire and 9 miles (14 km) northwest of Kirkconnel in Dumfries and Galloway.
It is located in the old county of Ayrshire, which disappeared following the Local Government (Scotland) Act 1974.
The parish has an area of 98.1 sq. km (37.8 sq. miles). Auchinleck has 8 neighbouring parishes; namely Crawfordjohn, Kirkconnel, Mauchline, Muirkirk, New Cumnock, Ochiltree, Old Cumnock and Sorn. The boundaries of this parish were modified as a consequence of the Local Government (Scotland), 1894.