Unsolved Problems in Number Theory

Unsolved Problems in Number Theory may refer to:

• Unsolved problems in mathematics in the field of number theory.
• A book with this title by Richard K. Guy published by Springer Verlag:
• First edition 1981, 161 pages, {{ISBN|0-387-90593-6}}
• Second edition 1994, 285 pages, {{ISBN|0-387-94289-0}}
• Third edition 2004, 438 pages, {{ISBN|0-387-20860-7}}

Books with a similar title include:

• Solved and Unsolved Problems in Number Theory, by Daniel Shanks
• First edition, 1962
• Second edition, 1978
• Third edition, 1985, {{ISBN|0-8284-1297-9}}
• Fourth edition, 1993
• Old and New Unsolved Problems in Plane Geometry and Number Theory, by Victor Klee and Stan Wagon, 1991, {{ISBN|0-88385-315-9}}.

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