  We present models of resonant self-interacting dark matter in a dark sector
with QCD, based on analogies to the meson spectra in Standard Model QCD. For
dark mesons made of two light quarks, we present a simple model that realizes
resonant self-interaction (analogous to the $\phi$-K-K system) and thermal
freeze-out. We also consider asymmetric dark matter composed of heavy and light
dark quarks to realize a resonant self-interaction (analogous to the
$\Upsilon(4S)$-B-B system) and discuss the experimental probes of both setups.
Finally, we comment on the possible resonant self-interactions already built
into SIMP and ELDER mechanisms while making use of lattice results to determine
feasibility.
