Ella Knowles Haskell (July 31, 1860 – January 27, 1911) was an American lawyer, suffragist, and politician. Born in New Hampshire, she moved to Montana to improve her health following a bout of tuberculosis and there became the first woman to be licensed as a lawyer, the first female notary public, the first woman to run for Montana State Attorney General, and the 26th woman to be admitted to practice before the US Supreme Court. She served as the President of the Montana Equal Suffrage Association and was widely known in Montana for her advancement of the suffrage movement, political feminism and social equity.