Barack Obama delivered several notable speeches throughout his political career. Here are some of the most significant ones:

1. 2004 Democratic National Convention Keynote Address: This speech catapulted Obama into the national spotlight. He spoke about the unity of America and the potential for change, introducing himself as a "skinny kid with a funny name."

2. "A More Perfect Union" (2008): Delivered during his presidential campaign, this speech addressed the complex issues of race in America. It was a response to controversial remarks made by his former pastor, Jeremiah Wright.

3. Inaugural Addresses (2009 and 2013): As the first African American president, Obama's inaugural speeches focused on themes of hope, change, and the challenges facing the nation.

4. Cairo Speech (2009): Known as "A New Beginning," this speech was delivered at Cairo University and aimed to mend relations between the United States and the Muslim world.

5. Nobel Peace Prize Acceptance Speech (2009): After being awarded the Nobel Peace Prize, Obama delivered a speech in Oslo discussing the complexities of war and peace.

6. State of the Union Addresses: Throughout his presidency, Obama delivered several State of the Union addresses, outlining his administration's priorities and legislative agenda.

7. Selma Speech (2015): On the 50th anniversary of the Selma to Montgomery marches, Obama delivered a powerful speech on civil rights and the ongoing struggle for equality.

8. Farewell Address (2017): In his final speech as president, Obama reflected on his time in office, the progress made, and the challenges ahead.

These speeches are remembered for their eloquence, depth, and impact on both national and international audiences.