U15 or U-15 may refer to:

• German submarine U-15, various vessels
• Greek submarine Argonaftis (U15)
• SM U-15 (Austria-Hungary), a submarine of the Austro-Hungarian Navy

• U15 (German universities), a university association in Germany
• U15 Group of Canadian Research Universities

• U15 (Berlin U-Bahn), a transit line
• Cubohemioctahedron
• Small nucleolar RNA SNORD15
• Uppland Runic Inscription 15

Topics referred to by the same term

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