The Little Red-Haired Girl's grandmother is a minor unseen character in the Peanuts comic strip by Charles M. Schulz. As the name implies, she is the grandmother of the Little Red-Haired Girl. Like her granddaughter, and most adults, she has never been seen.
The character is first referred to in the strip from May 30, 1968, in which Charlie Brown decides to be brave, ring the doorbell of the Little Red-Haired Girl's house and introduce himself. He is surprised when her grandmother, who also has red hair, opens the door instead. In the following day's strip, an embarrassed and tongue-tied Charlie Brown can think of nothing else to say to the woman except for, "You're a cute grandmother!"
The Little Red-Haired Girl's grandmother is mentioned again in the strips from November 26 to November 30, 1996, in which Charles Brown is walking, and passes the Little Red-Haired Girl's house. Charlie Brown says he sees someone in the window of the house, and waves thinking it is the Little Red-Haired Girl. The person in the window waves back, but Charlie Brown realizes that it is the Little Red-Haired Girl's grandmother, and not her. The next day, Charlie Brown passes the Little Red-Haired Girl's house again, but this time, with Linus van Pelt. Charlie Brown tells Linus that he always waves to the Little Red-Haired Girl's grandmother, when he passes her house. Linus suggests that Charlie Brown should use the grandmother as an excuse to meet the Little Red-Haired Girl, but Charlie Brown does not like that idea.
Nothing more is said of the Little Red-Haired Girl's grandmother after that.