The Onslow baronetcy, of West Clandon in the County of Surrey, was created in the Baronetage of England on 8 May 1674 for Arthur Onslow, with the precedence of 1660.
The Onslow baronetcy, of Althain in the County of Lancaster, was created in the Baronetage of Great Britain on 30 October 1797 for the naval commander Admiral Sir Richard Onslow.
The title was awarded in recognition of his services at the Battle of Camperdown where he was second in command.
The present holder of the baronetcy is also in remainder to the Onslow baronetcy of West Clandon and in special remainder to the barony of Onslow.
The heir presumptive is Roger Cranley Seafield Onslow (born 1934), a kinsman of the current Baronet.