Thomas Frederick Onslow (15 January 1821 – 15 July 1883) was an English first-class cricketer.
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 Surrey and the Marylebone Cricket Club.
Onslow represented 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.