Third Watch is een Amerikaanse dramaserie van de zender NBC. De serie ging in première op 23 september 1999.
Third Watch volgt de belevenissen van politieagenten, brandweermannen en ambulancepersoneel in het fictionele 55th Precinct. De dienst van het personeel loopt tussen 3.00pm tot 11.00pm, de zogenaamde Third Watch.
Everyone in the 55th Precinct faces their worst fears when terrorists are discovered to possibly be building a dirty bomb. Carlos and Levine face trouble in their relationship. Captain Finney decides to end his life, rather than surrender himself for the murder of Ty Davis Sr. Brendan and Davis try to cover it up.