  We calculate the bulk viscosity of color-superconducting quark matter in the
color-flavor-locked (CFL) phase. We assume that the lightest bosons are the
superfluid mode H and the kaons K0 and K+, and that there is no kaon
condensate. We calculate the rate of strangeness-equilibrating processes that
convert kaons into superfluid modes, and the resultant bulk viscosity. We find
that for oscillations with a timescale of milliseconds, at temperatures T << 1
MeV, the CFL bulk viscosity is much less than that of unpaired quark matter,
but at higher temperatures the bulk viscosity of CFL matter can become larger.
