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Dylan Walsh -- best known for his role as Dr. Sean McNamara on "Nip/Tuck" -- was involved in a serious car crash with his family over the weekend.

The accident happened on Sunday, August 17th, while Walsh and four other passengers were riding in a 2022 Ford Explorer in New Jersey. Everett Collection

According to the Rumson Police Department ... the vehicle was heading northbound when it suddenly veered into the southbound lane.

Walsh's car then smashed into a utility pole and kept moving ... before colliding with and damaging another utility pole.

Police say two of the five people in the SUV were taken to a medical center with complaints of pain. It's unclear who needed treatment -- or who was behind the wheel. Getty

The actor's rep tells TMZ ... "Over the weekend, Dyla

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