- May 1, 1968
- May 2, 1968
- May 3, 1968
- May 4, 1968
- May 5, 1968
- May 6, 1968
- May 7, 1968
- May 8, 1968
- May 9, 1968
- May 10, 1968
- May 11, 1968 (This strip is adapted in the 1976 documentary, Happy Anniversary, Charlie Brown)
- May 12, 1968
- May 13, 1968
- May 14, 1968
- May 15, 1968
- May 16, 1968
- May 17, 1968 (This strip is adapted in A Charlie Brown Valentine, The Peanuts Movie and in the episode "Go for it, Charlie Brown!" from the 2014 French TV series Peanuts)
- May 18, 1968 (This strip is adapted in the episode "A Bad Mood" from the 2014 French TV series Peanuts)
- May 19, 1968 (This strip is adapted in the segment "Charlie Brown and Lucy" of the 1983 The Charlie Brown and Snoopy Show episode "Snoopy the Psychiatrist" and in the episode "Go for it, Charlie Brown!" from the 2014 French TV series Peanuts)
- May 20, 1968
- May 21, 1968
- May 22, 1968
- May 23, 1968
- May 24, 1968
- May 25, 1968 (This strip is adapted in Happiness Is a Warm Blanket, Charlie Brown)
- May 26, 1968
- May 27, 1968
- May 28, 1968
- May 29, 1968
- May 30, 1968 (The Little Red-Haired Girl's grandmother is referred to for the first time)
- May 31, 1968
← April 1968 | June 1968 → |