This publication, titled A Colour Handbook on Rainfed Rabi Crops: Protection, Constraints, and Mitigation Strategies, aims to assist students, field researchers, agriculture department field functionaries, scholars, and farmers in correctly identifying important insect pests, diseases, and weeds that plague rainfed Rabi crops. The book describes the damaging symptoms, identification characteristics, biology, and management techniques of over 100 pest species, accompanied by coloured illustrations. The correct identification of these pests is not only necessary for strict quarantine to prevent the spread of new species, but also to achieve desired productivity levels.