The Tachikawa Ki-77 was a Japanese very long-range experimental transport and communications aircraft of World War II derived from a design commissioned by a newspaper to break the flight distance record set by a rival.

The Ki-77's overall design was developed under the aegis of Dr. Hidemasa Kimura of the Aeronautical Research Institute of the University of Tokyo, with Tachikawa Aircraft Company being responsible for manufacturing and detail drafting work.

The aircraft's layout was finalized in autumn of 1940 with its first flight originally expected in late 1941, but this was canceled with the start of war against the United States and consequent reallocation of priorities.

[1] In response to a flight made by an Italian Savoia-Marchetti S.M.75GA which flew to Japan in July 1942 with stops in Russia and China, the Japanese decided to forge a link with Europe, but wished to avoid Soviet-controlled airspace.

The prototype suffered from persistent oil cooling problems which required many changes before being solved, delaying further flights into July 1943; while working on these engineering issues, Tachikawa built a second aircraft.

The pilot was Juukou Nagatomo, the co-pilot was Hajime Kawasaki, Kenji Tsukagoshi and Noriyoshi Nagata were flight engineers, and Motohiko Kawashima was the radio operator.