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