Computational Physics with R provides a comprehensive introduction to computational methods in physics, designed for students and researchers who wish to use R as their primary programming environment. While computational physics is often taught with languages such as C++, Python, or Fortran, this book fills a unique gap by adopting R, a language widely known for statistical computing and data visualisation, and demonstrating its effectiveness in tackling core problems in physics. The book adopts a strongly pedagogical approach: it emphasizes step-by-step construction of algorithms, reproducible code, and guided exercises with fully worked solutions. The book is both a teaching resource and a reference for practical problem-solving in physics. Key Features: First book on Computational Physics using the R programming language. The book can also be used as a thorough introduction to the R language for physicists. The book is accessible at an advanced undergraduate level. The book can be used both as introduction to fundamental Computational Physics and as reference to advanced Computational Physics. The book can be used as text book for a one- or two-semester courses on Computational Physics. Each section ends with a few recommended computing exercises and suggested computing projects. Solutions to both are included. Each chapter opens with learning objectives and closes with an end-of-chapter summary.