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 had 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.