Police are seeking the assistance of the public to help locate missing man, Ken Fletcher.

Ken Fletcher, 79, from NSW, is holidaying on Kangaroo Island and was last seen at a Penneshaw address about 6.30pm last night, Monday 21 February.

Police and his family are concerned for his welfare as he suffers from a medical condition.

Ken Fletcher is about 157 cm tall, large build, with thinning grey hair and a grey beard.  He was wearing a navy parka and jeans.

Anyone who spots Ken Fletcher or has information on his whereabouts is asked to contact the police assistance line immediately on 131 444.