NACA may refer to:

• National Advisory Committee for Aeronautics
• National Athletic and Cycling Association of Ireland
• National Association for Campus Activities [1]
• Neighborhood Assistance Corporation of America, a community advocacy and homeownership organization. [2]
• Network of Aquaculture Centres in Asia-Pacific, an industry association of shrimp farmers and other aquaculture industries. [3]

• North American Collectibles Association [4]
• Normal Auto Contingent Allegiance, a SCSI term.

• One of several technological innovations developed by the National Advisory Committee for Aeronautics:

• NACA duct, a common form of air intake used on various vehicles
• NACA cowling, a type of aerodynamic fairing
• NACA airfoil, a family of wing cross-sections

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