Police are searching for 69-year-old Denis William Jeffries, who was last seen at around midday in Leschenault on Saturday 6 October 2018.
Mr Jeffries was cycling west on his bike along Marine Drive.
He is described as approximately 175cm tall, medium build, fair skinned, with a grey beard and moustache, receding grey/dark hair and has brown eyes.
Denis was riding a black and white Scott hybrid bicycle. He is believed to be wearing a light polo t-shirt, black shorts, purple and white sneakers and an old bicycle helmet.
He is known to regularly cycle long distances in the Australind/Leschenault area.
If you see Denis, or know where he is, please call Police on 131 444 or 97970222.