Officers were called around 2:30 am to Noble Avenue and Dollner Street.
When police arrived, they found a female pedestrian lying in the roadway. She was pronounced dead at the scene.
Her name has not been released.
Investigators say she was hit by a car, but the driver was nowhere to be found. No description of the suspect's vehicle has been provided.
Anyone with information is asked to call the Visalia Police Department at 559-713-4232.