Sir Arthur Onslow, 1st Baronet (1622 – 21 July 1688) was an English politician who sat in the House of Commons at various times between 1641 and 1685.
Onslow was educated at Queen's College, Oxford in 1639 and at Lincoln's Inn in 1640.
He took an active role in political affairs during the English Civil War.
[1] On 8 May 1674, Onslow obtained a patent in reversion to succeed to his father-in-law Thomas Foote's baronetcy upon his death without heirs, with the precedence of the original creation.
He became, therefore, a baronet upon Foote's death in 1687, but died less than a year later, and was succeeded by his eldest son Richard.