The aim of this paper is to study the effects of land tenure on agricultural production. This is an econometric study of production functions for the Ferozepur district of Punjab using Farm Management Studies data for 1968/69 and 1969/70. After a brief review of the theoretical literature, production functions are estimated to test for differences between small and large farms and for the relative inefficiency of tenants (on an inferior production function) relative to owners. We get slightly ambiguous results on the farm size issue but we find that the more land leased in by a farmer the less efficient he is.