A central Queensland man has disappeared after he was last seen driving a ute in Mackay on September 11.

Detectives are appealing for help in the search for a central Queensland man, missing for nearly three weeks.

Kurt Kempton, 26, was last seen driving a grey ute on a residential street in the Boyne Valley, south of Mackay, about noon on September 11.

His family are concerned because his disappearance is out of character.

Mr Kempton is described as 180cm tall, of large build, with brown eyes and dark hair.

He was driving a 2012 dual-cab Holden Colorado with the registration 780-TQG.