In North American Television a midseason replacement is a television show that premieres in the second half of the traditional television season, usually between January and April. Midseason replacements usually take place after a show that was in the fall schedule was canceled, put on hiatus or had a shorter season than other shows and the timeslot needs to be filled. Some midseason replacements get canceled like the shows they replaced, but others have gone on to be very successful.
Notable shows that started as midseason replacements include:
| Series Name | Original Air Date | Replaced Series |
|---|---|---|
| Airwolf | 1984 | |
| All in the Family | January 12, 1971 | |
| Batman | January 12, 1966 | |
| Buffy the Vampire Slayer | March 10, 1997 | |
| Coach | 1989 | |
| Dallas | September 23, 1978 | |
| Dawson's Creek | January 20, 1998 | |
| Dr. Quinn Medicine Woman | January 1, 1993 | |
| Dynasty | January 12, 1981 | |
| Eight Is Enough | March 15, 1977 | |
| Emergency! | January 15, 1972 | The Good Life |
| Grey's Anatomy | March 27, 2005 | |
| Happy Days | 1974 | |
| Hill Street Blues | 1981 | |
| The Incredible Hulk | 1978 | |
| It Takes a Thief | January 9, 1968 | |
| The Jeffersons | January 18, 1975 | |
| Just Shoot Me! | March 4, 1997 | |
| Kate & Allie | March 19, 1984 | |
| King of the Hill | January 12, 1997 | |
| Knots Landing | December 27, 1979 | |
| Laverne & Shirley | 1976 | |
| Malcolm in the Middle | January 9, 2000 | |
| Married... with Children | April 5, 1987 | |
| Medium | January 3, 2005 | |
| Moesha | January 23, 1996 | |
| Moonlighting | 1985 | |
| My Wife and Kids | March 28, 2001 | |
| Nash Bridges | March 29, 1996 | |
| Night Court | January 1984 | |
| Numb3rs | January 23, 2005 | |
| Perfect Strangers | 1986 | |
| Quantum Leap | March 1989 | |
| Rules of Engagement | February 5, 2007 | The New Adventures of Old Christine |
| The New Adventures of Old Christine | March 13, 2006 | |
| The Office | March 24, 2005 | |
| The Practice | March 4, 1997 | |
| The Simpsons | December 17, 1989 | |
| The Six Million Dollar Man | January 18, 1974 | |
| The Unit | March 7, 2006 | |
| The Wonder Years | March 15, 1988 | |
| 3rd Rock from the Sun | January 9, 1996 | |
| Three's Company | March 15, 1977 | |
| Unhappily Ever After | January 11, 1995 | |
| Walker, Texas Ranger | April 21, 1993 |
