AbstractDimensional analysis is introduced, and applications of it to human geography are considered. Primary and secondary dimensions are selected; techniques of dimensional analysis are used to derive and check a functional relationship drawn from central place theory, to test the dimensional implications of a power function (the Pareto gravity model), to disaggregate a theoretical parameter (the exponential distance decay coefficient), and to simplify a complex system of variables in agricultural location theory to a system of dimensionless products. Difficulties inherent in the application of dimensional analysis to human geography are discussed.