The famous civil rights leader known for organizing the March on Washington is Martin Luther King Jr.. This iconic event, held in 1963, aimed to advocate for civil and economic rights for African Americans. King’s leadership during the march galvanized support for the civil rights movement and culminated in his legendary "I Have a Dream" speech, which articulated a vision for racial equality and justice. His work has left an indelible mark on American history, as it inspired subsequent generations to continue the fight for social justice and civil rights.