daughter of John Whitfield of Ives Place, Maidenhead, Berkshire.
He was admitted at Middle Temple on 26 November 1707 and matriculated from King's College, Cambridge at Easter 1715.
[2] Orlebar was returned in a contest as a Whig Member of Parliament for Bedford at the 1727 British general election.
In 1728 the Whig members of the Bedford corporation tried to turn out their Tory recorder, Lord Bruce, by legal proceedings, and offered the prospective vacancy to Orlebar.
Orlebar died on 19 December 1765, leaving a son and four daughters.