SUO may refer to:

• Senior Under Officer, a military cadet rank in Commonwealth nations
• Standard upper ontology, in computing
• The IATA identifier for Sunriver Airport in Sunriver, Oregon, USA
• "Solution User Options", in Visual Studio parlance

Microsoft Visual Studio is an integrated development environment (IDE) from Microsoft. It is used to develop computer programs for Microsoft Windows, as well as web sites, web applications and web services. Visual Studio uses Microsoft software development platforms such as Windows API, Windows Forms, Windows Presentation Foundation, Windows Store and Microsoft Silverlight. It can produce both native code and managed code.

Suo was also the Japanese name for Suao, Yilan, Taiwan.