Textbook in PDF format 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