- December 1, 1968
- December 2, 1968 (This strip is adapted in the segment "The Play" from The Charlie Brown and Snoopy Show episode "Sally's Sweet Babboo")
- December 3, 1968
- December 4, 1968
- December 5, 1968
- December 6, 1968 (Hover mouse here to see math problem solution. This strip is adapted in There's No Time for Love, Charlie Brown. Franklin replaces Roy)
- December 7, 1968
- December 8, 1968
- December 9, 1968
- December 10, 1968
- December 11, 1968
- December 12, 1968
- December 13, 1968
- December 14, 1968
- December 15, 1968
- December 16, 1968 (Beethoven's birthday)
- December 17, 1968
- December 18, 1968 (The first reference to Citizen Kane in Peanuts)
- December 19, 1968
- December 20, 1968
- December 21, 1968
- December 22, 1968
- December 23, 1968
- December 24, 1968
- December 25, 1968
- December 26, 1968
- December 27, 1968
- December 28, 1968
- December 29, 1968
- December 30, 1968
- December 31, 1968 (This strip ends the first full year without "Pig-Pen" appearing)
← November 1968 | January 1969 → |