San or SAN (acronym) may refer to:

In mathematics:

• Stochastic Activity Network, stochastic extension to Petri nets
• Standard algebraic notation, the most common algebraic chess notation

In technology:

• Storage area network, a network designed to attach computer storage devices
• Styrene-acrylonitrile resin, a plastic

In biology:

• Sinoatrial node, pacemaking tissue in the right atrium of the heart
• Stochastic Activity Network, stochastic extension to Petri nets

In history:

• The Battle Creek Sanitarium was nicknamed The San by its guests.

In fiction:

• San (comics) is the name of a character of the Marvel Universe.
• Princess Mononoke, San is the original name of Princess Mononoke.

In geography:

• San, Mali, a town
• San River, a river in south-eastern Poland and western Ukraine, the Celt's word (san) means exactly river too.
• Sydney Adventist Hospital, due to the original name being the Sydney Sanitarium, which was shortened to the word "san".

In organizations and groups:

• Khoisan, in Southern Africa, also known as the San people, or Khwe Khoe, or Basarwa.
• South African Navy

In transportation:

• San Motors, an Indian automobile manufacturer.
• San Diego International Airport, IATA airport code
• Sandersville Railroad, The AAR reporting mark

In Music:

• San (参) is High and Mighty Color's 3rd Album

In other languages:

• the Italian and Spanish word for Saint
• San (letter), Greek letter between Pi and Qoppa
• -san, a Japanese title used after a person's name, the equivalent of Mr., Mrs. or Miss. Postfix of polite expressions like "Suzuki-san", "Ichirou-san", or "Suzuki Ichirou-san" to name a personal family name or last name, verbally and literally, generally regardless of position, sex, age, and other factors.

• Pronunciation of 3 in Japanese and Mandarin Chinese
• Dream, in some Slavic languages
• Mountain, in Korean and Japanese.

Other uses:

• Senior Advocate of Nigeria
• Standard Address Number, a number used in the book trade to identify a supplier.