Sing may refer to:

• Singing, the act of producing musical sounds with the voice

Sing Party (formerly just SiNG, and stylized as SiNG PARTY) is a music/party video game developed by FreeStyleGames and published by Nintendo for the Wii U. It is a karaoke-style game and was released on the Wii U's launch day in North America, and in Europe in January 2013.

Singular may refer to:

• Singular number, in grammar, a term for words denoting a unit quantity, as opposed to the plural and other forms
• Singular homology
• SINGULAR, an open source Computer Algebra System (CAS)
• Singular or sounder, a group of boar, see List of animal names
• Singular matrix, a matrix that is not invertible
• Singular measure, a measure or probability distribution whose support has zero Lebesgue (or other) measure
• Singular cardinal, an infinite cardinal number that is not a regular cardinal
• The property of a singularity or singular point in various meanings; see Singularity (disambiguation)

Singular (typeset Singular) is a computer algebra system for polynomial computations with special emphasis on the needs of commutative and non-commutative algebra, algebraic geometry, and singularity theory. Singular is free software released under the GNU General Public License. Problems in non-commutative algebra can be tackled with the Singular offspring Plural. Singular is developed under the direction of Wolfram Decker, Gert-Martin Greuel, Gerhard Pfister, and Hans Schönemann, who head Singular's core development team within the Department of Mathematics of the University of Kaiserslautern.