Busselton police have requested information to find a man in his late 30s who may be in the Bunbury area.
Officers said they were seeking information from the public to locate 37-year-old Troy Johnston who they believed could assist with several ongoing investigations.
Mr Johnston was described as 180cm tall, of a slim build, with brown hair and brown eyes.
It was believed Mr Johnston may be in the Bunbury area.
Anyone with information is asked to contact police immediately on 131 444.