- April 1, 1973
- April 2, 1973
- April 3, 1973
- April 4, 1973
- April 5, 1973
- April 6, 1973
- April 7, 1973
- April 8, 1973 (Basis for the song "Poor Sweet Baby" from Snoopy!!! The Musical and its animated TV adaptation)
- April 9, 1973
- April 10, 1973
- April 11, 1973
- April 12, 1973
- April 13, 1973
- April 14, 1973
- April 15, 1973
- April 16, 1973
- April 17, 1973
- April 18, 1973
- April 19, 1973
- April 20, 1973
- April 21, 1973 (Ending of a storyline which was later adapted as the segment "Baseball" of the The Charlie Brown and Snoopy Show episode "You Can't Win, Charlie Brown")
- April 22, 1973 (The third appearance of Snoopy as the Easter Beagle and Frieda's only appearance in 1973. This strip is adapted in It's the Easter Beagle, Charlie Brown)
- April 23, 1973
- April 24, 1973
- April 25, 1973
- April 26, 1973
- April 27, 1973
- April 28, 1973
- April 29, 1973
- April 30, 1973
| ← March 1973 | May 1973 → |