Edmond Nicolas Laguerre (9 April 1834, Bar-le-Duc – 14 August 1886, Bar-le-Duc) was a French mathematician[1] and a member of the Académie des sciences (1885).

His main works were in the areas of geometry and complex analysis.

He also investigated orthogonal polynomials (see Laguerre polynomials).

Laguerre's method is a root-finding algorithm tailored to polynomials.

He laid the foundations of a geometry of oriented spheres (Laguerre geometry and Laguerre plane), including the Laguerre transformation or transformation by reciprocal directions.