The historical figure known for delivering the "I Have a Dream" speech is Martin Luther King Jr. He delivered this iconic address during the March on Washington for Jobs and Freedom on August 28, 1963. Standing before a large audience at the Lincoln Memorial, King spoke passionately about his dream of a racially integrated and harmonious America where individuals are judged by their character rather than skin color. The speech became a defining moment in the civil rights movement, inspiring activism and promoting the vision of equality and justice.