- May 1, 1981
- May 2, 1981
- May 3, 1981 (This strip is adapted in the episode "Sound and Sensibility" from the 2014 French TV series Peanuts)
- May 4, 1981
- May 5, 1981
- May 6, 1981
- May 7, 1981 (Belle, who last appeared in the strip from July 1, 1976, returns)
- May 8, 1981 (Belle's only speaking role. This strip is adapted for the end credits of The Peanuts Movie)
- May 9, 1981
- May 10, 1981 (This strip is adapted in the episode "Birds of a Feather" from the 2014 French TV series Peanuts)
- May 11, 1981 (Belle's last appearance)
- May 12, 1981 (The last indirect reference to Belle)
- May 13, 1981
- May 14, 1981
- May 15, 1981
- May 16, 1981 (This strip is adapted as the segment "Song" in It's an Adventure, Charlie Brown)
- May 17, 1981
- May 18, 1981
- May 19, 1981
- May 20, 1981
- May 21, 1981
- May 22, 1981
- May 23, 1981
- May 24, 1981
- May 25, 1981
- May 26, 1981
- May 27, 1981 (This strip is adapted for the end credits of The Peanuts Movie)
- May 28, 1981
- May 29, 1981
- May 30, 1981
- May 31, 1981 (This strip is adapted in the segment "Rainy Day" of the 1983 The Charlie Brown and Snoopy Show episode "It's That Team Spirit, Charlie Brown")
| ← April 1981 | June 1981 → |