The Lockheed Ventura is a twin engine patrol bomber designated PV-1 by the United States Navy (US Navy). The bomber was also used by the United States Army Air Forces (USAAF), which designated it the Lockheed B-34 (Lexington) and B-37. The Ventura was a medium bomber of World War II, used by United States and British Commonwealth forces in several guises, including antishipping and antisubmarine search and attack.
The Ventura was developed from the Lockheed Model 18 Lodestar transport, as a replacement for the Lockheed Hudson bombers then in service with the Royal Air Force. After USAAF monopolization of land-based bombers was removed, the US Navy ordered a revised design which entered service as the PV-2 Harpoon for anti-submarine work.