- December 1, 1990 (This strip was reprinted on December 4, 1997)
- December 2, 1990 (This strip was reprinted on December 28, 1997)
- December 3, 1990
- December 4, 1990 (This strip was reprinted on December 5, 1997)
- December 5, 1990 (This strip was reprinted on December 6, 1997)
- December 6, 1990 (This strip was reprinted on December 8, 1997)
- December 7, 1990
- December 8, 1990 (This strip was reprinted on December 9, 1997)
- December 9, 1990
- December 10, 1990 (This strip was reprinted on December 10, 1997)
- December 11, 1990 (This strip was reprinted on December 11, 1997)
- December 12, 1990 (This strip was reprinted on December 12, 1997)
- December 13, 1990 (End of a storyline that was later adapted in It's Christmastime Again, Charlie Brown. This strip was reprinted on December 13, 1997)
- December 14, 1990
- December 15, 1990 (This strip is used on the page for September 22 of the Dayspring Peanuts: A Year's Worth of Smiles and Blessings Desk Calendar)
- December 16, 1990
- December 17, 1990
- December 18, 1990 (This strip was reprinted on December 2 1997)
- December 19, 1990 (This strip is adapted in I Want a Dog for Christmas, Charlie Brown)
- December 20, 1990
- December 21, 1990
- December 22, 1990
- December 23, 1990 (This strip is adapted in the segment "Merry Christmas from Charlie Brown" of the 2002 special Charlie Brown's Christmas Tales)
- December 24, 1990
- December 25, 1990
- December 26, 1990
- December 27, 1990 (This strip is adapted in It's Christmastime Again, Charlie Brown and used on the page for December 23 of the Dayspring Peanuts: A Year's Worth of Smiles and Blessings Desk Calendar)
- December 28, 1990
- December 29, 1990
- December 30, 1990
- December 31, 1990
| ← November 1990 | January 1991 → |