- January 1, 1990: (The first comic strip of 1990, and the 1990's.)
- January 2, 1990:
- January 3, 1990:
- January 4, 1990:
- January 5, 1990:
- January 6, 1990:
- January 7, 1990: (This comic was made into a Quickie.)
- January 8, 1990:
- January 9, 1990:
- January 10, 1990:
- January 11, 1990:
- January 12, 1990:
- January 13, 1990:
- January 14, 1990:
- January 15, 1990:
- January 16, 1990:
- January 17, 1990:
- January 18, 1990:
- January 19, 1990:
- January 20, 1990:
- January 21, 1990:
- January 22, 1990:
- January 23, 1990:
- January 24, 1990:
- January 25, 1990:
- January 26, 1990:
- January 27, 1990:
- January 28, 1990: (This comic was made into a Quickie.)
- January 29, 1990:
- January 30, 1990:
- January 31, 1990:
| ← Garfield, December 1989 | Garfield, February 1990 → |