Y8 may refer to:

Shaanxi Y-8, a Chinese transport aircraft KJ-200, also known by the NATO reporting name "Moth" or "Y-8 Balance Beam", a Chinese airborne early warning and control aircraft. LNER Class Y8, a class of British steam locomotives Yangtze River Express, an IATA airline designator Youth 8 summit, more commonly known as the Y8 summit, the youth counterpart to the G8 summit

See also 8Y (disambiguation)