Berndt O. Mueller (also Berndt Müller) (born 8 February 1950 in Markneukirchen, German Democratic Republic) is a German-born theoretical physicist who specializes in nuclear physics.
Müller moved with his mother to Frankfurt am Main in 1953 , where they joined his father.
He enrolled as a student at the Goethe University Frankfurt in 1968 and graduated in 1972.
From 1976 he was a professor at the Goethe University Frankfurt.
Müller is concerned with the theory of quark–gluon plasma and evidence of its formation in heavy-ion scattering experiments (via enrichment with strange quarks), but also with chaos in gauge field theories, the Casimir effect, and neural networks.