The "stupid motorist law" is a law in the U.S. state of Arizona that states that any motorist who becomes stranded after driving around barricades to enter a flooded stretch of roadway may be charged for the cost of their rescue. The law corresponds to section 28-910 of the Arizona Revised Statutes.

If public emergency services (such as a fire department or paramedics) are called to rescue a flooded motorist and tow the vehicle out of danger in Arizona, the cost of those services can be billed to the motorist, plus additional liability of up to $2,000. Motorists are only liable if water already covers the road, barriers are in place but bypassed, and people are rescued from a vehicle. The 'stupid-motorist law' is not a chargeable statute; to be fined under the law, a motorist must commit at least one other violation.

Although the statute was enacted in 1995, only a handful of incidents had been prosecuted under ARS 28-910 as of 2015.