Plus may refer to:

• +, the mathematical sign, see plus and minus signs
• +, the international call prefix
• + (Ed Sheeran album), a 2011 album by Ed Sheeran
• PLUS Loan, a United States Federal student loan
• Plus Magazine, an online mathematics magazine
• Promoting Logical Unified Security, a system for rating a building's security
• Plus (programming language), developed at the University of British Columbia
• "+", a song by Ayumi Hamasaki on her album, Rainbow
• The Professional Liability Underwriting Society, a non-profit organization for the promotion and development of the professional liability industry

Microsoft Plus! was a commercial operating system enhancement product by Microsoft. The last edition is the Plus! SuperPack, which includes an assortment of screensavers, themes, and games, as well as multimedia applications. The Microsoft Plus! product was first announced on January 31, 1994 under the internal codename "Frosting."

Plus (stylised as +Plus) is a Japanese pop boy band formed in December 2009 that has been signed to the label, Pony Canyon. The group combines in its pop tunes elements of genres such as hip hop, reggae, and R&B.

Plus+ is a network created by ngmoco in June 2009. The network is much like that of Xbox Live where users have friends, what games they are playing, and news. This network relates a lot to one already existing known as OpenFeint as seen in the later topic. Jordan, Jon. "Ngmoco unveils its social networking Plus+ Network." Rev. of Plus+, by Jon Jordan. The service is similar to OpenFeint, AGON Online, and Scoreloop.

Plus steht für:
Pluszeichen, das grafische Symbol „+“

• das Symbol einer Summe, siehe Addition
• das Symbol von Zahlen größer Null, siehe positive und negative Zahlen
• positive physikalische Messwerte, siehe Referenzpunkt
• die internationale Verkehrsausscheidungsziffer (VAZ) in der Telekommunikation

Microsoft Plus! ist eine von Microsoft herausgegebene Programmsammlung zur Erweiterung von Microsoft Windows.

Les signes plus (+) et moins (–) sont universellement utilisés pour représenter les opérations d’addition et de soustraction et peuvent avoir d’autres significations plus ou moins analogues.

Plustecken (+) betecknar räkneoperationen addition och används även som förtecken för positiva tal för att skilja dem från negativa i sådana sammanhang där positiva och negativa angivelser är lika normala, till exempel vid temperaturangivelser. Annars betraktas ett tal utan förtecken normalt som positivt.