The Boeing X-46 was a proposed unmanned combat air vehicle (UCAV) that was to be developed in conjunction with the United States Navy and DARPA as a naval carrier-based variant of the Boeing X-45 UCAV being developed for the U.S. Air Force. Two contracts for technology demonstrators were awarded in June 2000, to Boeing for the X-46A and to Northrop Grumman for the

X-47A The Northrop Grumman X-47 is a demonstration unmanned combat aerial vehicle. The X-47 began as part of DARPA's J-UCAS program, and is now part of the United States Navy's UCAS-D program to create a carrier-based unmanned aircraft. Unlike the ...

. However, in April 2003, the Air Force and the Navy efforts were formally combined under the joint DARPA/USAF/Navy J-UCAV program, later renamed J-UCAS ( Joint Unmanned Combat Air Systems), and the X-46 program was terminated as redundant. A Navy-only N-UCAS demonstrator program started in the summer of 2006."Navy UCAS Program Set To Be Launched Within Weeks"
. ''Aviation Week and Space Technology'', 21 July 2006. Boeing will use material developed for the X-46 and X-45 to propose the X-45N as a naval UCAV demonstrator."Bids are in for U.S. Navy''s UCAS-D"
. ''Aviation Week and Space Technology'', 1 April 2007.

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{{X-planes X-46 Unmanned aerial vehicles of the United States Single-engined jet aircraft Cancelled military aircraft projects of the United States DARPA