Maureen Fairweather, 68, has spent three decades of weekdays looking after the children at Robert Peel Lower School in Sandy, both in the dining hall and in the playground.
She applied for the job while her youngest son was still at the school and has kept the job ever since.
Maureen, of Leeds Smith Drive in Sandy, said: “I just like looking after children. I think they keep you young to be honest. I shall miss it a lot; not the being out in the bad weather but seeing the children. It’s such a friendly school.”
Headteacher Dave Saunders said: “She’s given 30 years of excellent service to the school.
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“The school appreciates all she’s done and we wish her luck in her well deserved retirement.”