The fourth season of MADtv aired from August 29, 1998, to May 22, 1999, with 25 episodes.
4 - 1Episode #401 Sep. 12, 1998- 4 - 2Episode #402 Sep. 19, 1998
- 4 - 3Episode #403 Sep. 26, 1998
- 4 - 4Episode #404 Oct. 03, 1998
- 4 - 5Episode #405 Oct. 12, 1998
- 4 - 6Episode #406 Oct. 31, 1998
- 4 - 7Episode #407 Nov. 07, 1998
- 4 - 8Episode #408 Nov. 14, 1998
- 4 - 9Episode #409 Nov. 21, 1998
- 4 - 10Episode #410 Dec. 05, 1998
- 4 - 11Episode #411 Dec. 12, 1998
- 4 - 12Episode #412 Jan. 09, 1999
- 4 - 13Episode #413 Jan. 16, 1999
- 4 - 14Episode #414 Jan. 30, 1999
- 4 - 15Episode #415 Feb. 06, 1999
- 4 - 16Episode #416 Feb. 13, 1999
- 4 - 17Episode #417 Feb. 20, 1999
- 4 - 18Episode #418 Feb. 27, 1999
- 4 - 19Episode #419 Mar. 13, 1999
- 4 - 20Episode #420 Mar. 27, 1999
- 4 - 21Episode #421 Apr. 10, 1999
- 4 - 22Episode #422 May. 01, 1999
- 4 - 23Episode #423 May. 08, 1999
- 4 - 24Episode #424 May. 15, 1999
- 4 - 25Episode #425 May. 22, 1999