Abstract
This research aims to measure the technical, allocative and economic efficiency for dairy plants in the Saudi Arabia, used data envelopment analysis model, which is a linear programming method of non-parametric. The results of this research include:(1) the average technical efficiency of about 76.2% in light of the constant returns to scale, and this means that the dairy plants could increase its production by 23.8% without any increase in the amount of resources used in production, while the variable returns to scale of approximately 90.2%. (2) in light of the constant returns to scale average allocative efficiency of dairy plants amounted to about 88.8, and this means that the redistribution of economic resources lead to lowering the cost of dairy products manufacturing by up to 11.2%. In light of variable returns to scale, the average distributive efficiency of the resources used in all dairy plants reached 88.3% (3) the average efficiency of the economies of scale of about 83.4%, also found that 71% of the dairy factories in the Saudi Arabia in increasing returns to scale for any stage it operates When the size or level of production is less than optimal.