Principles of Macroeconomics is designed for students beginning their journey in economics, focusing on macroeconomic variables like consumption, production, investment, inflation, and more. It uses real-life examples from the Saudi economy to connect theory with practice. Prepared for the College of Administrative Sciences, it provides a broad foundation in macroeconomics. The book includes insights from faculty at King Saud University and uses English symbols for consistency with international works. It contains 14 chapters covering GDP, consumption, investment, money, banking, inflation, policies, growth, trade, and exchange rates, with key concepts and questions at each chapter's end. Feedback is encouraged. Special thanks to colleagues and contributors for their support.