A
- Jessica Alba, defining the word "scrumptious"
- Buzz Aldrin, who answers Cookie Monster's question about whether the Moon is a big cookie
- Jason Alexander
- Maya Angelou one segment with some of the kids and Elmo singing about the fact they like their names 'just fine'.
- Kofi Annan, then the Secretary-General of the United Nations, Annan defuses a conflict between the Muppet monsters. Annan has also appeared on Takalani Sesame, a South African adaptation of the series.
- Alan Arkin
- Will Arnett as "Max the Magician", Season 39 Episode 6
- Arthur Ashe
Read more about this topic: List Of Guest Stars On Sesame Street