We present results for the differential distributions of
jets from non-leptonic decays of polarized
top quarks within the Standard Model, including QCD radiative
corrections. Our work extends existing results
which are only available for semileptonic top quark
decays at the parton level.
For $t(\uparrow)\to b$-jet $+2$ light jets
we compute in particular the QCD-corrected top-spin
analysing power of the $b$-quark jet and the least energetic
light jet. The dependence of the results on the choice
of the jet recombination scheme is found to be small.
In addition we compute the spin analysing
power of the thrust axis. Our results constitute a so far
missing ingredient to analyse top quark production and
subsequent non-leptonic decay at next-to-leading order in $\alpha_s$, keeping
the full information on the top quark polarization.
