  We measure the differential microlensing of the UV Fe II and Fe III emission
line blends between 14 quasar image pairs in 13 gravitational lenses. We find
that the UV iron emission is strongly microlensed in 4 cases with amplitudes
comparable to that of the continuum. Statistically modeling the magnifications
we infer a typical size of r ~ 4*sqrt(M/Msun) light-days for the Fe line
emitting regions which is comparable to the size of the region generating the
UV continuum (3 ~ 7 light-days). This may indicate that a significant part of
the UV Fe II and Fe III emission originates in the quasar accretion disk.
