  The temperature dependence of the moment of inertia of a dilute Bose gas
confined in a harmonic trap is determined. Deviations from the rigid value, due
to the occurrence of Bose-Einstein condensation, reveal the superfluid
behaviour of the system. In the noninteracting gas these deviations become
important at temperatures of the order of $T_c N^{-1/12}$. The role of
interactions is also discussed.
