NAIA might refer to the following:

• Ninoy Aquino International Airport, in Pasay and Parañaque City, Metro Manila, Philippines.
• National Animal Interest Alliance an animal welfare group in the United States.
• Newfoundland Aquaculture Industry Association an aquaculture industry group in Canada.
• North American Institute of Aviation in the United States.
• National Association of Intercollegiate Athletics in the United States.