U17 or U-17 may refer to:

• German submarine U-17, one of several German submarines
• Cessna U-17, military model of Cessna 185
• FIFA U-17 World Cup, football (soccer) championship for boys under 17 years
• FIFA U-17 Women's World Cup, football (soccer) championship for girls under 17 years
• For the U17 Bandy World Championship for boys, see Youth Bandy World Championship
• For the U17 Bandy World Championship for girls, see Bandy World Championship G-17
• Nonconvex great rhombicuboctahedron
• A comic website in China, 'U17' has the similar pronunciation with the Chinese words 'With the scent of mythical creatures'.

• Eohric of East Anglia
• Eoh Wu-dong
• Eohypsibiidae
• Eoiai
• EOI Business School
• Eoin
• Eoin Cadogan
• Eoin Cairns
• Eoin colfer
• Eoin Concannon
• Eoin Dillon
• Eoin Dunphy
• Eoin G. Harty
• Eoin griffin
• Eoin Griffin
• Eoin Harty
• Eoin Kelly (disambiguation)
• Eoin Macken
• Eoin Mac Neill
• Eoin Mac Néill
• Eoin MacWhite
• Eoin McCarthy
• Eoin Monaghan
• Eoin Morley
• Eoin O Broin