U2 or U-2 is a letter-number conjunction, which can refer to:

Music

• U2, an Irish rock band
• U2 (album), an album by the music group Negativland

Military

• Lockheed U-2, a US reconnaissance aircraft
• U-2 Crisis of 1960, an international incident involving the Lockheed U-2
• Unterseeboot 2, several German submarines
• Polikarpov Po-2, a Soviet biplane

Railway

• U2 line on the Berlin U-Bahn.
• U2 line on the Vienna U-Bahn
• U2 line on the Frankfurt U-Bahn.
• U2 line on the Hamburg U-Bahn.
• U2 line on the Munich U-Bahn.
• U2 line on the Nuremberg U-Bahn.
• Siemens-Duewag U2, a light rail vehicle.

Also

• U2 Clothing, a casual-wear brand.
• The IATA airline code for the airline easyJet.

U2 | U2 (flertydig) | U2 (Begriffsklärung) | U2 (desambiguación) | U2 (apartigilo) | U2 | U2 | U2 | U2 | U2 | U2 (曖昧さ回避) | U2 | U2 (ujednoznacznienie) | U2 (desambiguação) | U2 (razločitev) | U2 (olika betydelser) | U2