Gertrude Ward, Countess of Dudley (née Millar; 21 February 1879 – 25 April 1952), known as Gertie Millar, was an English actress and singer of the early 20th century, known for her performances in Edwardian musical comedies.

Beginning her career at age 13, Millar was a prominent star of musical comedies for two decades. In 1902, she married the composer Lionel Monckton, who wrote the scores of many of her shows and songs that she made famous. She was one of the most prominent West End theatre performers of the early 20th century, starring in such long-running hits as The Toreador (1901), The Orchid (1903) The Spring Chicken (1905), The New Aladdin (1906) The Girls of Gottenberg (1907), Our Miss Gibbs (1909), The Quaker Girl (1910), Gipsy Love (1912), The Dancing Mistress (1912), The Marriage Market (1913), and A Country Girl (1914).

After Monckton died in 1924, Millar married the 2nd Earl of Dudley.