ASB or asb may refer to:

• Ashgabat Airport, IATA code ASB
• Antisocial behavior
  • Anti-social Behaviour Act 2003, an act of parliament in the United Kingdom, called the ASB law
• Asymbescaline, a psychedelic drug similar to Mescaline
• American Saddlebred, horse breed
• Apostilb, a unit of luminance
• Alt.sex.bondage, a Usenet newsgroup
• Alien space bats, a term used while discussing implausible points of divergence in alternate history
• Asociación de Scouts de Bolivia
• Advanced stop box, an area at an intersection reserved for certain types of vehicles.
• Arbeiter-Samariter-Bund Deutschland, a German charity

Education

• Aarhus School of Business, a Danish business school
• Adventist School Bouchrieh, a Lebanese-American school
• Alternative Spring Break, an elongated phrase for Alternative break
• Ancell School of Business, the business school at Western Connecticut State University in Danbury, Connecticut
• The Alabama School for the Blind, part of the Alabama Institute for Deaf and Blind
• American School of Barcelona, a private tri-lingual school (pre-K to 12th Grade) in Barcelona, Spain
• Asia School of Business, a business school cofounded by Bank Negara Malaysia and MIT Sloan School of Management, and located in Kuala Lumpur, Malaysia
• Associated Student Body, a type of student organization
• The Australian School of Business, a business school at the University of New South Wales, Sydney, Australia

Business

• Accounting Standards Board, responsible for issuing accounting standards in United Kingdom
• ASB Bank, one of the largest banks in New Zealand
• Auditing Standards Board, a technical committee related to accounting in the United States
• American Savings Bank, Hawaii's third-largest financial institution

Writing

• A. S. Byatt (born 1936), English critic, novelist, poet and short story writer
• Archives of Sexual Behavior, a sexology journal
• Alternative Service Book, a prayer book of the Church of England