Mum is a British sitcom written by Stefan Golaszewski that centred on the recently widowed, suburban 59-year-old Cathy (played by Lesley Manville) and her family, following her husband's death, airing on BBC Two from 2016–2019. Each episode is named after a calendar month in the year, except series three which is set over just one week. The series features Cathy's supportive lifelong friend, Michael (played by Peter Mullan), and her family: son Jason and his girlfriend, Kelly; Cathy's brother, Derek, and his new partner, Pauline; and Cathy's in-laws.

In June 2016, the BBC announced that a second series had been commissioned. In October 2017, it was recommissioned for a third series. The second series premiered on 20 February 2018. Lisa McGrillis revealed that the third series would be the last; it premiered on 15 May 2019.