- September 1, 1961 (Miss Othmar, who had quit teaching on February 5, 1960, returns to Linus' school. This strip is adapted in the shorts "Have a Nice Day, Linus" and "Miss Othmar, the Return" from the 2014 French TV series Peanuts)
- September 2, 1961
- September 3, 1961
- September 4, 1961
- September 5, 1961
- September 6, 1961
- September 7, 1961
- September 8, 1961
- September 9, 1961
- September 10, 1961 (Football gag for 1961, Charlie Brown's ear is missing in the 13th panel)
- September 11, 1961
- September 12, 1961
- September 13, 1961
- September 14, 1961
- September 15, 1961
- September 16, 1961
- September 17, 1961 (This strip is adapted in the segment "Blanket" from The Charlie Brown and Snoopy Show episode "Snoopy's Football Career")
- September 18, 1961 (This strip is adapted in A Charlie Brown Christmas)
- September 19, 1961
- September 20, 1961
- September 21, 1961 (This strip is adapted in A Boy Named Charlie Brown)
- September 22, 1961
- September 23, 1961
- September 24, 1961
- September 25, 1961
- September 26, 1961
- September 27, 1961 (This strip and the following three strips are adapted in the shorts "Have a Nice Day, Linus" and "Miss Othmar, the Return" from the 2014 French TV series Peanuts)
- September 28, 1961
- September 29, 1961
- September 30, 1961