Lucy Kennedy Miller (1880–1962), also known as Mrs. John O. Miller, was a prominent 20th-century American suffragist who became the president of the Equal Franchise Federation of Pittsburgh, Pennsylvania and the first president of the Pennsylvania League of Women Voters (PLWV). In 1919, the League of Women Citizens of Pennsylvania (forerunner of the PLWV) called her "the woman to whom, more than to any other" was "owe[d] the triumph of" women's suffrage in the Commonwealth of Pennsylvania.