In Sickness and in Health is a BBC television sitcom that ran between 1 September 1985 and 3 April 1992. It is a sequel to the successful Till Death Us Do Part, which ran between 1966 and 1975, and Till Death..., which ran for one series of six episodes in 1981. The series includes 47 episodes, and, unlike its predecessor, all the episodes have survived and are available on DVD.

The show's theme tune was performed by Chas and Dave and two versions of the lyrics were used – the original version in Series 1 and then revised from Series 2 onward to reflect the Else Garnett character's death. The lyrics were changed again for the episodes set in Australia during the fourth series.