In mathematics, algebroid may refer to several distinct notions, which nevertheless all arise from generalising certain aspects of the theory of algebras or Lie algebras.

• Algebroid branch, a formal power series branch of an algebraic curve
• Algebroid cohomology
• Algebroid multifunction
• Courant algebroid, an object generalising Lie bialgebroids
• Lie algebroid, the infinitesimal counterpart of Lie groupoids
  • Atiyah algebroid, a fundamental example of a Lie algebroid associated to a principal bundle
• R-algebroid, a categorical construction associated to groupoids

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