  We discuss the influence of free carriers on the Raman scattering in $n$-type
In$_2$O$_3$. For high-quality cubic single crystals, electronic single-particle
excitations are revealed as a relatively broad Raman feature in the frequency
range below 300~cm$^{-1}$. Furthermore, discrete phonon lines in the same
frequency range exhibit asymmetric lineshapes characteristic for Fano
resonances. The two observed spectral features contain the potential to be
utilized for the quantitative determination of the free carrier concentration
in $n$-type In$_2$O$_3$ using Raman spectroscopy as a contactless experimental
technique.
