Mihailo Petrovic Alas (Serbian Cyrillic: ??????? ???????? ????; 6 May 1868 – 8 June 1943), was an influential Serbian mathematician and inventor.
He was also a distinguished professor at Belgrade University, an academic, fisherman, writer, publicist, musician, businessman, traveler and volunteer in the First and Second World Wars.
He was a student of Henri Poincaré, Paul Painlevé, Charles Hermite and Émile Picard.
Petrovic contributed significantly to the study of differential equations and phenomenology, as well as inventing one of the first prototypes of a hydraulic analog computer.