Fenwick is a parish, which lies in East Ayrshire Council Area, some 5 miles (8 km) east of Stewarton and 5 miles (8 km) north of Galston in East Ayrshire.
It is located in the old county of Ayrshire, which disappeared following the Local Government (Scotland) Act 1974.
The parish has an area of 73.4 sq. km (28.3 sq. miles). Fenwick has 6 neighbouring parishes; namely Dreghorn, Eaglesham, Kilmarnock, Loudoun, Mearns and Stewarton.