Denzil Onslow (27 July 1802 – 10 February 1879) was an English first-class cricketer associated with Cambridge University who was active in the 1820s.
He is recorded in two matches from 1821 to 1825, totalling 31 runs with a highest score of 26.
He was admitted to Lincoln's Inn in 1823 but is not recorded to have been called to the bar.
He succeeded to Staughton House on his father's death and was a Justice of the Peace, and also High Sheriff of Huntingdonshire in 1963.
This biographical article related to an English cricket person born in the 1800s is a stub.