Which auto insurance companies write non-owner liability for a rental car?

Rental CarNone. No insurance company will write you a policy for the specific purpose of renting a car. You have to buy the insurance through the rental car company. That's why they offer it. AnswerYes, but remember this is liability. Some policies cover you no matter the vehicle and some only provide liability. This means you cover OTHER vehicles in case of accident, not the rental. Do yourself a favor and purchase damage waiver insurance, in case you crash the car or a tree falls on it and you don't wind up paying for a car you don't own.