The Haynes Owner's Workshop Manuals (commonly known as simply Haynes Manuals) are a series of practical manuals from the British company Haynes Publishing Group (: ) aimed at DIY enthusiasts not really for professional garage mechanics because the manuals lack the depth of coverage on particular vehicles or problems. The series primarily focuses upon the maintenance and repair of automotive vehicles, covering a wide range of makes and models (300 models of car and 130 models of motorcycle), but it also includes manuals in the same style for domestic appliances and personal computers, digital photography, model railways, men and babies, sex, and women. The last four were made slightly tongue in cheek, but have proved very popular.
Additionally they have released manuals based on popular fictional series including Star Trek and Thomas and Friends.
The Haynes manuals are named after John Harold Haynes. In 1956, when he was at school, he wrote and published a book on building a 'special' based on the Austin 7, and wrote two further books while performing national service in the Royal Air Force. J. H. Haynes & Co. Limited was founded on 18 May 1960 and the first manual actually entitled "Haynes Owners Workshop Manual", for the Austin-Healey Sprite, was published in 1965. Haynes was made an Officer of Order of the British Empire in the Queen's Birthday Honours List 1995 for services to publishing.
Many Haynes Manuals bear a cover illustration of a cutaway view technical drawing of the vehicle, hand-drawn by Terry Davey, and they bear his signature.