  Multiterminal transport measurements on YBCO crystals in the vortex liquid
regime have shown nonlocal conductivity on length scales up to 50 microns.
Motivated by these results we explore the wavevector ({\bf k}) dependence of
the dc conductivity tensor, $\sigma_{\mu\nu} ({\bf k})$, in the Meissner,
vortex lattice, and disordered phases of a type-II superconductor. Our results
are based on time-dependent Ginzburg-Landau (TDGL) theory and on
phenomenological arguments. We find four qualitatively different types of
behavior. First, in the Meissner phase, the conductivity is infinite at $k=0$
and is a continuous function of $k$, monotonically decreasing with increasing
$k$. Second, in the vortex lattice phase, in the absence of pinning, the
conductivity is finite (due to flux flow) at $k=0$; it is discontinuous there
and remains qualitatively like the Meissner phase for $k>0$. Third, in the
vortex liquid regime in a magnetic field and at low temperature, the
conductivity is finite, smooth and {\it non-monotonic}, first increasing with
$k$ at small $k$ and then decreasing at larger $k$. This third behavior is
expected to apply at temperatures just above the melting transition of the
vortex lattice, where the vortex liquid shows strong short-range order and a
large viscosity. Finally, at higher temperatures in the disordered phase, the
conductivity is finite, smooth and again monotonically decreasing with $k$.
This last, monotonic behavi or applies in zero magnetic field for the entire
disordered phase, i.e. at all temperatures above $T_c$, while in
