Abstract: Cheese is produced from ultrafiltered milk by a process wherein milk is acidified by lactic fermentation to a pH of about 4.4 or less to coagulate the milk and flocculate the casein therein, the acidified coagulated milk is ultrafiltered to produce a flowable acidified retentate, the acidified retentate is cooled to a temperature between 0.degree. and 4.degree. C. and stirred while avoiding foam production to deflocculate the casein, and the resultant retentate is converted into cheese by the action of rennet. Prior to converting the retentate into cheese, it may be mixed with an ultrafiltration retentate produced from sweet milk. The process permits accurate adjustment of the calcium content of the cheese being produced.