Abstract: A modular light and accessory bar for a vehicle includes a top rail having a length selected to span a width of the vehicle along the top of the windshield, a right end, and a left end. A right side pillar is configured to be attached to the top rail at the right end thereof and extend downwardly therefrom. A left side pillar is configured to be attached to the top rail at the left end thereof and extend downwardly therefrom. The top rail is formed with at least one T-slot that extends along the length of the top rail. At least one bracket is configured to support a lighting fixture or accessory and is attachable to the T-slot of the top rail at a desired location therealong. The T-slot is configured to permit the at least one bracket to be slid to a desired location along the top rail and secured at that location. The top rail may be curved forwardly relative to the vehicle.