The LHTEC T800 is a turboshaft engine for rotary wing applications.

It is produced by the LHTEC (Light Helicopter Turbine Engine Company), a joint venture between Rolls-Royce and Honeywell.

The engine was primarily developed for the United States Army's cancelled RAH-66 Comanche armed reconnaissance helicopter, but has found use in other applications.

The engine was originally developed for the United States Army's LHX armed reconnaissance helicopter competition, competing against the Avco/Pratt & Whitney T800.

The LHX program was canceled in 2004, primarily due to cost overruns during its lengthy development, and the US Army's changing requirements.