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Lamberto Cesari
Born	(1910-09-23)23 September 1910 Bologna
Died	12 March 1990(1990-03-12) (aged 79) Ann Arbor
Nationality	Italian
Citizenship	United States
Alma mater	Scuola Normale Superiore
Known for	Functions of bounded variation Nonlinear functional analysis Theory of surface area
Scientific career
Fields	Geometric measure theory Mathematical analysis Functional analysis Calculus of variation
Institutions	Istituto Nazionale per le Applicazioni del Calcolo Università di Pisa Università di Bologna University of Michigan
Doctoral advisor	Leonida Tonelli
Other academic advisors	Constantin Carathéodory Mauro Picone
Doctoral students	Jack K. Hale

Lamberto Cesari (23 September 1910 – 12 March 1990) was an Italian mathematician naturalized in the United States, known for his work on the theory of surface area, the theory of functions of bounded variation, the theory of optimal control and on the stability theory of dynamical systems: in particular, by extending the concept of Tonelli plane variation, he succeeded in introducing the class of functions of bounded variation of several variables in its full generality.