Arturo Rabassa was last seen at 8:30 a.m. Wednesday, May 24, on Route 112 in the hamlet of Port Jefferson Station.
The 93-year-old suffers from dementia and may be in need of medical attention, according to Suffolk County Police.
Rabassa is described as being 5-foot-1-inch tall and 150 pounds, bald, with blue eyes.
At the time of his disappearance, he was wearing a black hat, black sweater, gray pants, and black shoes.
Anyone with information is asked to contact the Suffolk County Police Department at 631-852-6690 or call 911.
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