  Active Galactic Nuclei (AGNs) and their relativistic jets belong to the most
promising class of ultra-high-energy cosmic ray (UHECR) accelerators. This
compact review summarises basic experimental findings by recent instruments,
and discusses possible interpretations and astrophysical constraints on source
energetics. Particular attention is given to potential sites and mechanisms of
UHECR acceleration in AGNs, including gap-type particle acceleration close to
the black hole, as well as first-order Fermi acceleration at trans-relativistic
shocks and stochastic shear particle acceleration in large-scale jets. It is
argued that the last two represent the most promising mechanisms given our
current understanding, and that nearby FR~I type radio galaxies provide a
suitable environment for UHECR acceleration.
