Plympton Swimming Pool will be closed for essential maintenance from 1pm on Saturday 8 December until Thursday 27 December.
Works will include improvements to the showers and changing rooms as well as relining the underground tank used to hold water for the pool.
The gym will remain open as usual throughout the works but there will be no changing facilities.
Deputy Council Leader Pete Smith said: “It’s really important to keep our facilities in good repair and this is generally the quietest time of year for our pools. We’d like to thank swimmers for bearing with us while this essential work is carried out.”