Vehicular manslaughter is a criminal offense defined as the unintentional killing (homicide) of another person as a result of criminal negligence or recklessness while operating a motor vehicle—often while the operator is intoxicated by alcohol or drugs, engaged in a high risk activity such as street racing, or committing a misdemeanor or infraction offense (speeding) with ordinary negligence.

Vehicular manslaughter is usually a felony offense and often includes significant jail or prison time as potential punishment. Vehicular manslaughter laws vary from state to state and are generally located in a state’s statutes—often in the penal or criminal code.

In Hawaii, vehicular manslaughter is referred to as 'Negligent Homicide.' There are three degrees of negligent homicide under Hawaii law, which are found in Hawaii Revised Statutes (HRS) Chapter 707. Negligent Homicide in the First Degree (HRS § 707-702.5) involves the death of a person as a result of the operation of a vehicle by a person under the influence of drugs or alcohol. Negligent Homicide in the Second Degree (HRS § 707-703) covers the unintentional killing of a person due to the gross negligence of the driver, while Negligent Homicide in the Third Degree (HRS § 707-704) pertains to deaths caused by the driver's simple negligence. The penalties for these offenses vary, with Negligent Homicide in the First Degree being the most serious and carrying the possibility of a class A felony charge, which can result in significant prison time. The exact penalties depend on the degree of the offense and the circumstances surrounding the incident.