This book, Designing English Language Curriculum and Materials, was developed to serve as a comprehensive resource for students, lecturers, and practitioners in English Language Education. It aims to provide both theoretical insights and practical guidance on curriculum and materials development, particularly in the context of English language teaching in Indonesia. The structure of the book begins with foundational perspectives, exploring definitions, philosophies, and curriculum theories. It then moves through key models and approaches, including both classical frameworks such as Tyler’s Rationale and Taba’s Grassroots Model, as well as more contemporary approaches like Task-Based Language Teaching, Content-Based Instruction, and Competency-Based Language Teaching. Further chapters guide readers through essential processes such as needs analysis, syllabus design, materials development, assessment, and the integration of technology into curriculum design.