U-9 or U9 may refer to:

• German submarine U-9, the designation of several German U-boats
• U-9, a U.S. Army designation for the Aero Commander 500, a light twin-engined aircraft
• U9, the IATA code for Tatarstan Airlines
• U9 (Berlin U-Bahn), a subway line in Berlin, Germany
• U9, a model of the Motorola ROKR cell phone
• Ultima IX: Ascension, a video game
• U9 League, a private university alliance in Taiwan.
• Yangwang U9, an electric supercar produced by BYD Auto

• 9U (disambiguation)

Topics referred to by the same term

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