The term employee engagement is becoming increasingly popular in the literature of various fields, including human resources, organizational psychology, leadership, and education. Over the past two decades, scholars put significant efforts to study engagement and practitioners strive hard to develop organization development (OD) related interventions to raise the levels of engagement among organizational members. Though the demand for engaging employees is growing, there is little consensus on how the construct should be measured. This review aims at generating instruments available in existing literature to measure employee engagement. It finds relevant measures, their properties, items used for measurement, theories upon which they are built etc. It also throws light to practitioners to identify appropriate scales before employing any of them.