Police are appealing to the public for information to help trace 26-year-old James Smith, whose car was found near Lamlash.
It is believed Mr Smith, from the Humberside area, has travelled to Ayrshire and may be on the Isle of Arran.
His motor vehicle, a white VW Amarok (Reg No FE66 VMC), was found on a forestry road, west of Lamlash.
Police Scotland said: "We believe he has been on Arran from at least the 8th November but could have been a few day before.
"Any assistance with tracing the male would be greatly appreciated.
"Any information to be reported on 101 quoting incident reference 2708 of 10th November."
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