Elizabeth Hay may refer to: Elizabeth Hay (novelist) (born 1951), Canadian writer Elizabeth Monroe Hay, full name of Eliza Monroe Hay (1786–1840) Elizabeth Wellesley, Duchess of Wellington (1820–1904), née Lady Elizabeth Hay, British peer Elizabeth Hay, Countess of Erroll (1801–1856), wife to the Earl of Erroll Betty Hay (1927–2007), American biologist