- September 1, 1961 (Miss Othmar, who had quit teaching on February 5, 1960, is to return to Linus' school. This strip is adapted in the short "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
- September 18, 1961 (This strip is adapted in A Charlie Brown Christmas)
- September 19, 1961
- September 20, 1961
- September 21, 1961
- 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 short "Miss Othmar, The Return" from the 2014 French TV series Peanuts)
- September 28, 1961
- September 29, 1961
- September 30, 1961
| ← August 1961 | October 1961 → |
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