The Tachikawa Ki-36 (named Ida in Allied reporting code) was a Japanese army co-operation aircraft of World War II.

It was a two-seat, low-wing monoplane with a single piston engine and fixed, tailwheel-type undercarriage.

The prototype, fitted with a 450 hp (336 kW) Hitachi Army Type 98 Ha-13 engine, first flew on 20 April 1938.

Having outperformed the Mitsubishi Ki-35 in comparative trials, the Ki-36 was designated the Army Type 98 Direct Co-operation Aircraft and ordered into production in November 1938.

Towards the end of the war, the Ki-36 was employed as a kamikaze aircraft with a bomb of 500-kg (1,102-lb) fitted externally.