Coccinellid beetles are predaceous on various insect pests such as aphids, mealy bugs, scale insects, mites, whiteflies and some other soft bodied insects. Literature review shows that they show significant role in control of agricultural and horticultural insect pests. Most of the coccinellid species are predatory in nature and considered as benignant. This review reveals the work done on the diversity of coccinellid beetles and highlights the role of coccinellid beetles as bio control agents of insect pests.