The teen was crossing the intersection of Ulmerton Road and Seminole Boulevard just before 10 p.m. Thursday night on his bicycle.
The boy was in the crosswalk, when he was hit by a pick up truck that left the scene of the accident, according to police.
The child is listed in critical condition at a local hospital. His identity is not being released at this time.
Witnesses described the vehicle as an older model full-sized pick up truck with a roll bar and yellow lights on the roof. The vehicle color is dark and there should be damage to the driver's side front end.
Police are seeking help in locating the suspect vehicle in this case. Anyone with information on this case should contact the Largo Police Department at 727-587-6730.