Lucas is a surname. Notable people with the surname include:
Aristocracy
Lucas as an aristocratic family name, Baron Lucas of Crudwell, may refer to:
- Mary Grey, Countess of Kent, 1st Baroness Lucas of Crudwell (died 1702)
- Henry Grey, 1st Duke of Kent, 2nd Baron Lucas of Crudwell (1671–1740)
- Anthony Grey, Earl of Harold, 3rd Baron Lucas of Crudwell (1695–1723)
- Jemima Yorke, 2nd Marchioness Grey, 4th Baroness Lucas of Crudwell (1722–1797)
- Thomas de Grey, 2nd Earl de Grey, 6th Baron Lucas of Crudwell (1781–1859)
- Anne Florence Cowper, 7th Baroness Lucas of Crudwell (1806–1880)
- Francis Cowper, 7th Earl Cowper, 8th Baron Lucas of Crudwell (1834–1905)
- Auberon Herbert, 9th Baron Lucas of Crudwell (1876–1916)
- Nan Ino Cooper, 10th Baron Lucas of Crudwell (1880–1958)
- Anne Rosemary Palmer, 11th baroness of Crudwell (1919–1991)
- Ralph Palmer, 12th Baron Lucas of Crudwell (born 1951)