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- Michelle Obama - shows kids how to plant vegetables.
- Conan O'Brien, one segment, two specials : O'Brien has guested on Sesame Street itself, as well as two special productions. While trying to deliver a tape in the Elmopalooza special, Big Bird runs through the set of Late Night with Conan O'Brien, where he is interviewing the Yip Yips; also seen is Andy Richter. O'Brien appeared in a celebrity montage of "Sing", for 2004 DVD What's the Name of That Song.
- Nancy O'Dell
- Rosie O'Donnell
- Bill O'Reilly
- Sandra Oh, as a Cookie Fairy (episode 4184).
- Ron O'Neal
- Donny Osmond
- Seiji Ozawa
Read more about this topic: List Of Guest Stars On Sesame Street