He was a Knight and he was recorded as being Lord Lieutenant of Buckinghamshire on two separate occasions, in both 1569 and 1587, though it is not recorded if he held that title for all the years in between.
He also served as Lord Lieutenant of Buckinghamshire following his father's death in 1686 but was dismissed after his first period in office by King James II for refusing to produce a list of Roman Catholics to serve as officers of the militia.
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The Lord Lieutenant of Buckinghamshire, Sir Henry Aubrey Fletcher Bt JP (Patron);
Molyneux's brother, Sir Vivian Molyneux, was a scholar, traveller and Royalist agent in the 1640s, and an uncle of Robert Earl of Caernarvon, Lord Lieutenant of Buckinghamshire.