  We measure the time-dependent CP asymmetry parameters in B0 --> K+ K- K0
based on a data sample of approximately 227 million B-meson pairs recorded at
the Upsilon(4S) resonance with the BaBar detector at the PEP-II B-meson Factory
at SLAC. We reconstruct two-body B0 decays to Phi(1020) K0S and Phi(1020)K0L,
and the three-body decay K+ K- K0S with Phi(1020) K0S excluded. For the B0 -->
Phi K0 decays, we measure sin(2 beta_{eff})(Phi K0) = +0.50 +/- 0.25(stat)
+0.07/-0.04(syst). The B0 --> K+ K- K0S decays are dominated by K+ K- S-wave,
as determined from an angular analysis; we measure sin(2 beta_{eff})(K+ K- K0S)
= +0.55 +/- 0.22(stat) +/- 0.04(syst) +/- 0.11(CP), where the last error is due
to the uncertainty in the fraction of CP-even contributions to the decay
amplitude. We find no evidence for direct CP violation.
