The 96-year-old Rosebud man was last seen in Redmond Court about 10am today.
He was last seen wearing grey trousers, navy blue sleeveless cardigan and a tweed hat.
Police and Les’s family have concern for his welfare as he has dementia and requires medication.
Les may be on foot and heading toward Frankston or Sorrento where he has family.
Police have released a photo of Les in the hope that someone may recognise him.
Anyone who sees Les is urged to call Rosebud police station on 5986 0425.