The truck bug deflector is a structure that is adapted for use with vehicles. The truck bug deflector comprises a primary shield and an auxiliary shield. The truck bug deflector is a structure that is attached to the front of a vehicle to protect the vehicle from damage caused by insects and debris that would otherwise hit the vehicle while the vehicle is in motion. The primary shield is adapted to be mounted on the grill guard of a vehicle and is designed to deflect insects and debris both away from the vehicle and away from the windshield of the vehicle. The auxiliary shield is adapted to be mounted to the grill guard of the vehicle and is designed to protect the lower portions of the vehicle from insects and debris.