A police spokesman said officers were called to reports of a crash at the intersection of Humber St and Ouse St about 3.30pm today.
It appears the car had collided with a brick wall and come to rest against a rail embankment, the spokesman said.
A Fire and Emergency New Zealand spokesman said two appliances from Oamaru station attended and assisted to extricate a trapped person.
A St John spokeswoman said two ambulances attended and took one patient to Oamaru Hospital with moderate injuries.