Peanuts is a popular comic strip about a group of philosophical children created by Charles M. Schulz. The strip began running in newspapers on October 2, 1950, and ended on February 13, 2000, the day after Schulz's death, after which newspapers began to rerun older strips under the title Classic Peanuts. The strip is known for its memorable characters, including perennial loser Charlie Brown, blanket-carrying philosopher Linus, fussbudget Lucy, and Charlie Brown's imaginative dog, Snoopy.
At its peak, Peanuts ran in over 2,600 newspapers, with a readership of 355 million in 75 countries, and was translated into 21 languages. The comic strip has spawned many television specials, four animated feature films, two stage musicals, and two television series. Snoopy was even ranked number six in Animal Planet's 50 Greatest TV Animals.
- A picture of Snoopy can be seen briefly in a Sesame Street live-action film "Round Things." The insert appeared in the Sesame Street Pitch Reel and the first test show, as well as later episodes of the series.
- At the end of a Sesame Street News Flash skit, when it literally "rains cats and dogs," one of the props used is a Snoopy doll.
- When the babies recruit Fozzie as a bug exterminator in "Bug-Busting Babies" he comments on their outfits and heavy gear, "Hey, if this is Halloween, can I be the Great Pumpkin?"
- The Muppet Babies episode "Comic Capers" made extensive use of Peanuts. Without Nanny to read them the comics, the babies persuade Baby Kermit to interpret a Peanuts Sunday strip. Later, Baby Kermit as Charlie Brown, Baby Rowlf as Schroeder, Baby Piggy as Lucy, and Baby Skeeter as the Peppermint Patty-like "Butterscotch Skeeter". In another scene, Baby Scooter, inside a computer, is turned into a variety of comic strip icons, including Charlie Brown. Clips from the various Peanuts animated specials were also used, and a brief scene of Charlie Brown being drawn appeared in the song "The Sunday Funnies."
- Snoopy: The Musical featured the original song "Just One Person", which has been used in many Muppet productions over the years.
- A scene featuring Elmo piloting a plane in the broadcast version of "Elmo's World: Transportation" is underscored with Vince Guaraldi's "Linus and Lucy" theme from the Peanuts television specials. The music was replaced when released on Elmo Wonders.
- The 1997 direct-to-video Sesame Street title Quiet Time features Telly acquiring advice from The Wise Man, who occupies a booth modeled after Lucy's "The Psychiatrist Is In" booth from the Peanuts comic strips and cartoons.
- In the book One Frog Can Make a Difference, Kermit expresses his disgust with being kissed by princesses by recalling a famous Peanuts moment: "Remember how when Snoopy kissed her, Lucy used to say, 'Yecch. Dog lips'"?
- In one Sesame Street segment, The Two-Headed Monster uses a newspaper in a number of ways. A Peanuts comic strip can be seen on the front of the newspaper.
- In Elmo's Christmas Countdown, when Stan the Snowball finds out that Stiller the Elf is in the story, he says that Stiller is famous, "like The Grinch, or Frosty, or that round-headed kid who picked out that crummy tree", referring to A Charlie Brown Christmas.
- In Sesame Street Unpaved, it's pointed out that Telly Monster shares his astrological sign, Libra, with Charlie Brown ("another great worrier").
- The musical You're a Good Man Charlie Brown features the song "Happiness", which has been performed on Sesame Street.
Several performers and crew members have worked on Peanuts adaptations, as well as with the Muppets.
- Roger Bart played Snoopy in You're a Good Man, Charlie Brown (1999, Broadway revival)
- Kristin Chenoweth played Sally in You're a Good Man, Charlie Brown (1999, Broadway revival), and Fifi in The Peanuts Movie (2015)
- Stacy Ann Ferguson voiced Sally Brown in It's Flashbeagle, Charlie Brown (1984), Snoopy's Getting Married, Charlie Brown (1985), and The Charlie Brown and Snoopy Show (1985)
- Clark Gesner wrote book, music and lyrics for You're a Good Man, Charlie Brown (1966 as concept album, 1967 Off-Broadway, 1971 on Broadway)
- Whoopi Goldberg hosted Heres to You, Charlie Brown: 50 Great Years (2000).
- Larry Grossman composed the songs for Snoopy: The Musical (1975, stage)
- Jeremy Miller voiced Linus in Happy New Year, Charlie Brown (1986, TV), Snoopy: The Musical (1988, TV), and one episode of This is America, Charlie Brown (1988, TV)
- Joe Raposo was the musical supervisor, arranger, and composed additional music for You're a Good Man, Charlie Brown (1971, Broadway debut)
- Judy Sladky plays the costumed Snoopy in various live appearances
- Frank Welker voiced various historical characters in This is America, Charlie Brown (1988-1989, TV)
- B. D. Wong played Linus in You're a Good Man, Charlie Brown (1999, Broadway revival)
- Madisyn Shipman, voiced Violet in The Peanuts Movie (2015)
Additionally, Universal Studios Japan, which features Sesame Street characters and attractions, also has a Snoopy Studios area with the Peanuts characters.