- December 1, 1999:
- December 2, 1999:
- December 3, 1999:
- December 4, 1999:
- December 5, 1999:
- December 6, 1999:
- December 7, 1999:
- December 8, 1999:
- December 9, 1999:
- December 10, 1999:
- December 11, 1999:
- December 12, 1999:
- December 13, 1999:
- December 14, 1999:
- December 15, 1999:
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- December 17, 1999:
- December 18, 1999:
- December 19, 1999:
- December 20, 1999:
- December 21, 1999:
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- December 25, 1999:
- December 26, 1999:
- December 27, 1999:
- December 28, 1999:
- December 29, 1999:
- December 30, 1999:
- December 31, 1999: (The last comic strip of 1999.)
| ← Garfield, November 1999 | Garfield, January 2000 → |