Recent results on production and decays of polarized top quarks
are reviewed.
Top quark pair production in $e^+e^-$ annihilation is considered
near energy threshold.
For longitudinally
polarized electrons the produced top quarks and antiquarks
are highly polarized.
Dynamical effects originating from strong interactions
and Higgs boson exchange in the
$t-\bar t$ system can be calculated using the Green function method.
Energy-angular distributions of leptons in semileptonic decays
are sensitive to the polarization of the decaying top
quark and to the Lorentz structure of the weak charged current.