DFZ may refer to:
*
Cosworth DFZ
The DFV is an internal combustion engine that was originally produced by Cosworth for Formula One motor racing. The name is an abbreviation of ''Double Four Valve'', the engine being a V8 development of the earlier four-cylinder FVA, which had f ...
, an engine produced for Formula One racing
*
Default-free zone, a collection of systems relating to Internet routing
*
Deflazacort, a pharmaceutical drug
{{disambig