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CA or ca may refer to:

Businesses and organizations[edit]


Government and political[edit]


  • Canadian Academy, an international school in Kobe, Japan
  • Cary Academy, a private college-preparatory school in Cary, North Carolina, United States
  • Claiborne Academy, a private school in Claiborne Parish, Louisiana, United States
  • Clarksville Academy, a private college-preparatory school in Clarksville, Tennessee, United States
  • Colorado Academy, a private college-preparatory school in Lakewood, Colorado, United States
  • Connections Academy, an online school based in Baltimore, Maryland, United States
  • Culver Academies, a boarding school and summer camp program in Culver, Indiana, United States

In sport[edit]

Other organizations[edit]

In linguistics[edit]

Mathematics, science, and technology[edit]

Biology and medicine[edit]


Mathematics and computing[edit]

Other uses in science and technology[edit]


Other uses[edit]

See also[edit]