The textbook "Integrated Photonics" provides a comprehensive introduction to numerical techniques for studying non-analytical structures in the field of integrated photonics. It is aimed at students in their advanced bachelor's or first master's year and assumes a basic understanding of electromagnetic waves as well as the ability to solve differential equations with boundary conditions. The chapters are structured to include numerical problems that can be solved using programs like Matlab or Mathematica. Special attention is given to the Beam Propagation Method, an important numerical simulation technique in the field of optoelectronic design. The book also includes small code examples to help the reader get started with numerical work.