The Stirling Mk.III, introduced in 1943, was similar to the Mk.I with the exception of the improved Hercules VI or XVI engines, which improved maximum speed from . The Mk.III used a fully glazed dorsal turret (the same FN.50 as in Lancaster) that had more room and an improved view. Early Mk.III Stirlings were fitted with a 12.7 mm Browning machine gun in the rear escape hatch (behind a perspex shield) to ward off German night fighters using the Schräge Musik system. Later Stirlings were fitted with an improved, low-drag remotely-controlled FN.64 ventral turret or a H2S radar. Mk.III Stirlings also were fitted with electronic countermeasure systems such as ventral antennas for the Mandrel jamming system as well as a ventral "window" chaff chute to jam Freya and Würzburg radars. Mk.III Stirlings were also fitted with a ventral antenna for the Blind Approach Beacon System which was a blind-landing aid and a Monica rear warning radar in the tail turret.
The Stirling Mk.III, introduced in 1943, was similar to the Mk.I with the exception of the improved Hercules VI or XVI engines, which improved maximum speed from . The Mk.III used a fully glazed dorsal turret (the same FN.50 as in Lancaster) that had more room and an improved view. Early Mk.III Stirlings were fitted with a 12.7 mm Browning machine gun in the rear escape hatch (behind a perspex shield) to ward off German night fighters using the Schräge Musik system. Later Stirlings were fitted with an improved, low-drag remotely-controlled FN.64 ventral turret or a H2S radar. Mk.III Stirlings also were fitted with electronic countermeasure systems such as ventral antennas for the Mandrel jamming system as well as a ventral "window" chaff chute to jam Freya and Würzburg radars. Mk.III Stirlings were also fitted with a ventral antenna for the Blind Approach Beacon System which was a blind-landing aid and a Monica rear warning radar in the tail turret.