Bu uçağın 26 değişik modelleri içinde B-26A (arttırılmış yakıt kapasitesi, sistem değişikliği ve daha kalın zırh 139 adet üretilmiştir), B-26B (daha büyük motorlar, silah donanımı iyileştirilmesi, 1,80metre kanat açıklığının artttırılması, daha büyük dikey kuyruk, daha fazla silah donanımı 1.883 adet üretilmiştir), B-26F (geliştirilmiş kalkış performansı ve ekipman tadilatı, 300 adet üretilmiştir),  ve JM-1 (Donanma için üretilen birkaç modelden biridir. Güverte personelinin hava savunması ve foto-keşif için kullanılmıştır.)

In accordance with the US Army Air Corps’ (USAAC) need for a high speed medium bomber, the Martin Company prepared and  submitted a design; a cantilever shoulder wing monoplane carrying five crewmen. While the plane met or exceeded all performance requirements. The wing optimized for high speed cruising but it was found to be unstable at low speeds during take-offs and landings. After a number of training accidents, modifications were made on the Marauder.

The B-26 carried a normal bomb load of 1,356 kg , though another 452 kg could be added when fitted with special wing hardpoints. Armament included eleven 12.7-mm machine guns in fixed, forward-firing, nose and waist mounts, and in powered dorsal- and tail-turrets. B-26s service ceiling was 6,020 meters, and its primary role was close tactical ground support. This was widely accepted and used in the Pacific theater and the Mediterranean by both the USAAC and the RAF. RAF acquired 522 B-26’s under Lend-Lease.