The British Rail Class 165 Networker Turbo is a fleet of suburban diesel-hydraulic multiple unit passenger trains, originally specified by and built for the British Rail Thames and Chiltern Division of Network SouthEast.
They were built by BREL York Works between 1990 and 1992. An express version was subsequently built in the form of the Class 166 Networker Turbo Express trains. Both classes are now referred to as "Networker Turbos".