Katharine Martha Houghton Hepburn (February 2, 1878 – March 17, 1951) was an American feminist social reformer and a leader of the suffrage movement in the United States. Hepburn served as president of the Connecticut Woman Suffrage Association before joining the National Woman's Party. In 1923 Hepburn formed the Connecticut Branch of the American Birth Control League with two of her friends, Mrs. George Day and Mrs. M. Toscan Bennett.