Mae Dug Wellington yn deitl ym Mhendefigaeth y Deyrnas Unedig. Crëwyd ym 1814 ar gyfer Arthur Wellesley.

• Arthur Wellesley, Dug 1af Wellington (1769-1852), o 1814
• Arthur Wellesley, 2il Dug Wellington (1807-1884), o 1852
• Henry Wellesley, 3ydd Dug Wellington (1846-1900), o 1884
• Arthur Wellesley, 4ydd Dug Wellington (1849-1934), o 1900
• Arthur Wellesley, 5ed Dug Wellington (1876-1941), o 1934
• Henry Wellesley, 6ed Dug Wellington (1912-1943), o 1941
• Gerald Wellesley, 7fed Dug Wellington (1885-1972), o 1943
• Arthur Wellesley, 8fed Dug Wellington (g. 1915), ers 1972