Laser-induced fluorescence line narrowing has been observed for the first time in a nonresonantly excited rare-earth system. Excitation with the 4727-\AA{}
A+ line into the
4G211 level of
Nd3+ in glass results in narrowing of transitions from the
4F23 to both the
4I29 ground manifold and the
4I211 excited manifold. The concentration dependence of the line narrowing provides information regarding resonant ion-ion energy transfer within the inhomogeneously broadened system.