The Yokosuka E6Y (Yokosuka Navy Type 91-1 Reconnaissance Seaplane (九一式水上偵察機)) was a Japanese submarine-based reconnaissance seaplane. It was developed by and for the Navy at the Yokosuka Naval Air Technical Arsenal. The Imperial Japanese Navy in the 1920s was looking at a submarine-based reconnaissance floatplane and specified a very small model. The prototype first flew as the Yokosho 2-Go (long designation: Yokosuka Arsenal No. 2 Reconnaissance Seaplane (横廠式二号水上偵察機)) in 1929. The aircraft was a single-seat biplane that could be quickly assembled and disassembled so that it could be stored on board a submarine. Two prototypes were built that differed in power plant and design details. Eight production machines followed with the designation E6Y built by Kawanishi in the 1930s and served with the Japanese submarine aircraft carriers I-5, I-6, I-7 and I-8. They saw limited action during the January 28 incident and the Second Sino-Japanese War, the last example being retired in 1943.

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