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Diabetes mellitus (DM) in cats is commonly managed with insulin injections and glycemic control is assessed with glucose monitoring systems. Automated insulin delivery (AID) systems, which integrate a continuous glucose monitoring system with an insulin pump controlled by a set algorithm, are successful in managing type 1 DM in humans but have not been reported in cats until now. Here, the use of an AID system is described in an 11-year-old cat with DM. After an initial 6 days of treatment with twice daily administration of protamine zinc insulin and insulin glargine, the AID was applied and managed by the cat owner. The system rapidly improved glycemic control and remission of DM was achieved. Throughout the application period, the AID system was well tolerated by the cat. This case suggests that AID systems can be used in diabetic cats and that they might improve glycemic control.