Background
Onslow was the son of British politician Thomas Cranley Onslow and the grandson of Thomas Onslow, 2nd Earl of Onslow, who played first-class cricket for pre-county club Surrey and the Marylebone Cricket Club.
Onslow was the son of British politician Thomas Cranley Onslow and the grandson of Thomas Onslow, 2nd Earl of Onslow, who played first-class cricket for pre-county club Surrey and the Marylebone Cricket Club.
Onslow represented pre-county club Hampshire, making his first-class debut in 1848 against an All-England Eleven. Onslow played one further match for the county against the same opposition in 1849. Onslow died at New Alresford, Hampshire on 15 July 1883.