One Day at a Time was a long-running American situation comedy on the CBS network which aired from December 16, 1975 to May 28, 1984. It portrayed a divorced mother, played by Bonnie Franklin, her two teenage daughters (Mackenzie Phillips and Valerie Bertinelli) and their building superintendent (Pat Harrington).

The show was created by Whitney Blake and Allan Manings, a husband-and-wife writing duo who were both actors in the 1950s and 1960s. The show was based on Whitney Blake's own life as a single mother, raising her child, future actress Meredith Baxter. The show was developed by Norman Lear and later Embassy Television.

Like many shows developed by Lear, One Day at a Time was more of a comedy-drama, using its half-hour to tackle serious issues in life and relationships, particularly those related to second wave feminism. The show's nine years give it the second-longest tenure of any Lear-developed sitcom under its original name, after The Jeffersons (All in the Family and its continuation series Archie Bunker's Place had a combined 12-year run, but only eight of those years were under the show's original name).

This sitcom follows recently divorced mother (Ann Romano) and her two teenage daughters (Barbara and Julie) as they start a new life together in Indianapolis, They are befriended by the building superintendent (Dwayne Schneider), who treats them like family. Together, these four main characters face life's challenges together. Written by Kate Tripper