Textbook in PDF format Statistical physics provides the microscopic theory for thermodynamic macroscopic properties of a physical system. These lecture notes introduce the necessary concepts of statistics and analytical mechanics for equilibrium thermodynamics with partition functions. They cover classical and quantum statistics, and treat advanced topics such as Langevin dynamics, the Fokker-Planck equation and phase transitions. Many systems like ideal classical and relativistic gases are worked out in detail. Statistical physics Thermodynamics Probability theory microcanonical ensemble Phase space dynamics Canonical ensemble Macrocanonical ensemble Quantum statistics Phase transitions Stochastic differential equations Mathematical supplement Physical supplement Acknowledgements Index