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- Sarah Jessica Parker, demonstrating "sighing" and "pairs"; looks for "big" with Super Grover
- Jim Parsons explains the word "arachnid"
- Pat Paulsen
- Fred Penner singing 'I Had a Rooster' and 'The Cat Came Back' on "Canadian Sesame Street".
- Chad Pennington, one segment: Pennington, a New York Jets player, appears during in season 38 (2007), along with other Jets, Elmo, and Elmo's goldfish Dorothy.
- Itzhak Perlman
- Rhea Perlman, She was the "old woman who lived in a shoe" that landed on Big Bird's nest after a hurricane
- Katy Perry, appearing in skit with Elmo parodying her hit song "Hot n Cold". The skit was intended to air on the actual series, but the producers overturned their decision due to parent's reaction to Perry's revealing wardrobe.
- Joe Pesci
- Regis Philbin
- Lou Diamond Phillips
- The Pink Panther
- Amy Poehler
- The Pointer Sisters
- John Popper
- Natalie Portman, plays "Princess and the Elephant" with Elmo; fills in for Alan at Hooper's when he goes on vacation to Hawaii
- Prince, teaches children how to make up their own songs.
- Richard Pryor
- Tito Puente
- Keshia Knight Pulliam
- Ellen Pompeo teaching the word "healthy"
Read more about this topic: List Of Guest Stars On Sesame Street