  We study the six classical event-shape observables in hadronic Higgs decays
at next-to-leading order in QCD. To this end, we consider the decay of on-shell
Higgs bosons to three partons, taking into account both the Yukawa-induced
decay to $\mathrm{b}$-quark pairs and the loop-induced decay to two gluons via
an effective Higgs-gluon coupling. The results are discussed with a particular
focus on the discriminative power of event shapes regarding these two classes
of processes.
