SU, Su or su may refer to:
A surname or family name is a name added to a given name. In many cases, a surname is a family name and many dictionaries define "surname" as a synonym of "family name".
The Sun is the star at the center of the Solar System. It is a nearly perfect sphere of hot plasma, with internal convective motion that generates a magnetic field via a dynamo process.
Sushi (すし, 寿司, 鮨) is the Japanese preparation and serving of cooked vinegared rice (鮨飯, sushi-meshi) combined with varied ingredients (ネタ, neta) such as chiefly seafood, vegetables, meat (usually fish), and occasionally tropical fruits.
Sugar is the generic name for sweet, soluble carbohydrates, many of which are used in food. There are various types of sugar derived from different sources.
Sufism or Taṣawwuf (Arabic: التصوف), which is often defined as "Islamic mysticism," "the inward dimension of Islam," or "the phenomenon of mysticism within Islam," is a mystical trend in Islam "characterized ...
Sulfur or sulphur (see spelling and etymology) is a chemical element with symbol S and atomic number 16. It is abundant, multivalent, and nonmetallic.