Drunk driving or drinking and driving is the act of operating a motor vehicle after having consumed alcohol (ethanol) or other drugs, to the degree that mental and motor skills are impaired. It is illegal in most jurisdictions within the U.S.

The specific criminal offence is usually called driving while intoxicated (DWI) or driving under the influence [of alcohol or other drugs] (DUI). Such laws may also apply to boating or piloting aircraft.