This contribution defines a new generalized input efficiency measure which encompasses and thus links four well-known input efficiency measures: the Debreu-Farrell measure, the Färe-Lovell measure, the asymmetric Färe measure, and the multiplicative Färe-Lovell measure. The axiomatic properties of this new measure are studied. The generalized input efficiency measure naturally leads to the definition of new measures as special cases. It also provides a general framework for testing the choice of efficiency measures. Examples of mathematical programming models in specific cases are established to illustrate this new measure.