Maud was born at Castle Badlesmere, Kent, England, the second eldest daughter of Bartholomew de Badlesmere, 1st Baron Badlesmere and Margaret de Clare.

Maud first husband was Robert FitzPayn, but the marriage was childless. After his death, she married John de Vere, 7th Earl of Oxford, Maud assumed the title Countess of Oxford.

In May 1338, Maud's brother Giles died without leaving male issue. A considerable portion of the Badlesmere estates was inherited by Maud and her husband.

The seven children born to Maud and John de Vere were: John de Vere married Elizabeth de Courtney as her first husband; Thomas de Vere, 8th Earl of Oxford, married Maud de Ufford, by whom he had a son Robert de Vere, 9th Earl of Oxford; Aubrey de Vere, 10th Earl of Oxford, married Alice FitzWalter, by whom he had three children, including Richard de Vere, 11th Earl of Oxford; Robert de Vere (died 1360); Elizabeth de Vere, married first in 1341, Sir Hugh de Courtney, by whom she had one son, Hugh de Courtney, Lord Courtney, she married second to John de Mowbray, 3rd Lord Mowbray, she married third on 18 January 1369 Sir William Costyn; Margaret de Vere (died 15 June 1398), married first to Henry de Beaumont, 3rd Lord Beaumont, the son of John de Beaumont, 2nd Lord Beaumont and Eleanor of Lancaster, by whom she had issue; she married second to Sir Nicholas de Lovain of Penhurst; she married third to after 1375 Sir John Devereux, by whom she had issue; Their last child was Maud de Vere.

Maud died at the de Vere family mansion Hall Place in Earl's Colne, Essex on 24 May 1366 at the age of fifty-six years. She was buried in Colne Priory. (This memorial and the bio was created in loving memory by the 15th great-granddaughter of Maud de Badlesmere de Vere. "Rest in Peace, Grandmother")