- December 1, 1981
- December 2, 1981
- December 3, 1981
- December 4, 1981
- December 5, 1981
- December 6, 1981
- December 7, 1981
- December 8, 1981
- December 9, 1981
- December 10, 1981
- December 11, 1981
- December 12, 1981
- December 13, 1981
- December 14, 1981
- December 15, 1981
- December 16, 1981 (Lucy's all-time high posted psychiatry fee, 50 cents)
- December 17, 1981
- December 18, 1981
- December 19, 1981
- December 20, 1981 (This strip is adapted in Why, Charlie Brown, Why?)
- December 21, 1981
- December 22, 1981
- December 23, 1981
- December 24, 1981
- December 25, 1981
- December 26, 1981
- December 27, 1981
- December 28, 1981
- December 29, 1981
- December 30, 1981
- December 31, 1981
← November 1981 | January 1982 → |