In American and Canadian television a midseason replacement is a television show that premieres in the second half of the traditional television season, usually between January and May. Midseason replacements usually take place after a show that was in the fall schedule was canceled or put on hiatus, or a program had a shortened season for some other reason which resulted in a time slot that needed filling.
Notable shows that started as midseason replacements include:
| Series Name | Original Air Date | Replaced Series |
|---|---|---|
| Airwolf | January 22, 1984 | |
| All in the Family | January 12, 1971 | |
| American Dad! | February 6 , 2005 | The Sketch Show |
| Andy Richter Controls the Universe | March 19, 2002 | That 70's Show |
| Barnaby Jones | January 28, 1973 | |
| Barney Miller | January 23, 1975 | |
| Batman | January 12, 1966 | |
| Blind Justice | March 8, 2005 | NYPD Blue |
| Blossom | January 3, 1991 | Ferris Bueller |
| Buffy the Vampire Slayer | March 10, 1997 | Savannah |
| Castle | March 9, 2009 | |
| Coach | February 28, 1989 | |
| Conviction | March 3, 2006 | The Book of Daniel |
| Cuts | February 14, 2005 | Second Time Around |
| Dallas | April 2, 1978 | |
| Dawson's Creek | January 20, 1998 | |
| Dr. Quinn Medicine Woman | January 1, 1993 | |
| Dollhouse | February 13, 2009 | Don't Forget the Lyrics! |
| Dynasty | January 12, 1981 | |
| Eight Is Enough | March 15, 1977 | |
| Emergency! | January 15, 1972 | The Good Life |
| Falcon Crest | December 4, 1981 | |
| Family Guy | January 31, 1999 | |
| For Your Love | March 18, 1998 | |
| George Lopez | March 27, 2002 | |
| Grey's Anatomy | March 27, 2005 | Boston Legal |
| Grounded for Life | January 10, 2001 | |
| Happy Days | January 15, 1974 | |
| Hill Street Blues | January 17, 1981 | |
| The Incredible Hulk | March 10, 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 | January 27, 1976 | |
| Law & Order: Trial By Jury | March 3, 2005 | Medical Investigation |
| Lie to Me | January 21, 2009 | Bones |
| Malcolm in the Middle | January 9, 2000 | Futurama |
| Medium | January 3, 2005 | LAX |
| Mister Ed | January 5, 1961 | |
| Moesha | January 23, 1996 | |
| Moonlighting | March 3, 1985 | |
| My Wife and Kids | March 28, 2001 | |
| Nash Bridges | March 29, 1996 | American Gothic |
| Night Court | January 4, 1984 | |
| The Norm Show | March 24, 1999 | The Secret Lives of Men |
| Numb3rs | January 23, 2005 | Dr. Vegas |
| Perfect Strangers | March 25, 1986 | |
| Quantum Leap | March 26, 1989 | |
| Rules of Engagement | February 5, 2007 | The New Adventures of Old Christine |
| Terminator: The Sarah Connor Chronicles | January 14, 2008 | K-Ville |
| The New Adventures of Old Christine | March 13, 2006 | Courting Alex |
| The Office | March 24, 2005 | Committed |
| The Practice | March 4, 1997 | NYPD Blue |
| The Simpsons | December 17, 1989 | Booker |
| Sister, Sister | April 1, 1994 | |
| The Six Million Dollar Man | January 18, 1974 | |
| Stacked | April 13, 2005 | Quintuplets |
| The Unit | March 7, 2006 | Love Monkey |
| The Wonder Years | March 15, 1988 | |
| 3rd Rock from the Sun | January 9, 1996 | Hudson Street |
| Three's Company | March 15, 1977 | |
| Unhappily Ever After | January 11, 1995 | |
| Walker, Texas Ranger | April 21, 1993 | |
| Wanda at Large | March 26, 2003 | Cedric the Entertainer Presents |
| The Deep End | December 10, 2009 | FlashForward |
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