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IGA or IgA may refer to:

Businesses and organizations[edit]

In government[edit]

In science and technology[edit]

  • Immunoglobulin A (IgA), an antibody playing a critical role in mucosal immunity
  • Intergranular attack, another term for intergranular corrosion (a form of corrosion where the boundaries of crystallites of the material are more susceptible to corrosion than their insides)

Other uses[edit]

See also[edit]