ATAG may refer to:

• Air Transport Action Group
• Authoring Tools Accessibility Guidelines (ATAG), a part of the Web Accessibility Initiative (WAI)

• Smith v Doe
• Smith, Verdelle
• Smith, Vernon
• Smith v Glasgow City District Council
• Smith v. Goguen
• Smith v Goguen
• Smith v Gould
• Smithville Apothecary
• Smithville, Bullitt County, Kentucky
• Smithville, Burlington County, New Jersey
• Smithville, California
• Smithville Christian High School
• Smithville Flats, New York
• Smithville Formation
• Smithville High School
• Smithville High School (disambiguation)
• Smithville High School (Texas)
• Smithville, Minnesota
• Smithville Public School Building
• Smithville, Utah
• Smith v. Kansas City Title & Trust Co
• Smith v Kansas City Title & Trust Co.
• Smith v. Kansas City Title & Trust Co.
• Smith v Land and House Property Corporation
• Smith v Leach Brain & Co Ltd