The present book entitled “Biotechnology, Immunology, Biotechniques and Biostatistics” is designed to meet the demand for a text book for paper II prescribed for B.Sc. Zoology Third Year in the new Unified Syllabus for a number of State Universities in India. The book is divided in four Units provided in the syllabus for this paper. Unit I on Biotechnology consists of Chapters 1-9, Unit II on Immunology consists of Chapter 10-18, Unit III on Biotechniques consists of Chapters 19-28 and the last Unit IV on Biostatistics consists of Chapters 29-36. Efforts have been made to faithfully cover the entire contents for this paper.