The notable civil rights leader known for his advocacy in the 1960s was Martin Luther King Jr.. He was a prominent figure in the American civil rights movement, advocating for nonviolent protests against racial segregation and discrimination. King’s vision of equality and justice was encapsulated in his famous "I Have a Dream" speech delivered during the 1963 March on Washington. His efforts led to significant legislative changes, including the Civil Rights Act of 1964 and the Voting Rights Act of 1965. King’s dedication to civil disobedience and his belief in achieving change through love and understanding made him an enduring symbol of the fight for social justice.