In this paper we present some models used in Greece for farm planning and farm decision making. All models were developed in the Department of Agricultural Economics of Thessaloniki University. Specifically, we present the operational research models used at farm or regional level in order to assist the farmers and the decision makers in improving their decisions . Among these are quadratic programming models, multiobjective programming models, data envelopment analysis models and three dimensional transportation models . First, we present a farm records and accounts computer system which provides the necessary economic and technical data for the application of the above models.