The influential leader in the civil rights movement known for the “I Have a Dream” speech was Martin Luther King Jr.. His profound advocacy for racial equality and nonviolent resistance became pivotal during the 1960s. The speech, delivered during the 1963 March on Washington, articulated King's vision for a future free from racial injustice, resonating with millions. King’s impactful leadership and tireless efforts to challenge discrimination ultimately contributed to landmark legislation, such as the Civil Rights Act of 1964, solidifying his legacy as a key figure in the struggle for civil rights in the United States.