William Maynard, 2nd Baron Maynard (c. 1623 – 3 February 1688/89) was an English aristocrat, the son of William Maynard, 1st Baron Maynard and Anne Everard. He married Dorothy Banastre. He later married Lady Margaret Murray, daughter of William Murray, 1st Earl of Dysart and Catherine Bruce. He was Comptroller of the Household from 1672 to 1687 and Custos Rotulorum of Essex from 1673 to 1688. By Margaret he had one daughter, Elizabeth. She married , son of and Grace Hewet (daughter of ), on 26 January 1691-92 at the Chapel Royal in Whitehall, London.