  We consider chiral fermion confinement in scalar thick branes, which are
known to localize gravity, coupled through a Yukawa term. The conditions for
the confinement and their behavior in the thin-wall limit are found for various
different BPS branes, including double walls and branes interpolating between
different AdS_5 spacetimes. We show that only one massless chiral mode is
localized in all these walls, whenever the wall thickness is keep finite. We
also show that, independently of wall's thickness, chiral fermionic modes
cannot be localized in dS_4 walls embedded in a M_5 spacetime. Finally, massive
fermions in double wall spacetimes are also investigated. We find that, besides
the massless chiral mode localization, these double walls support
quasi-localized massive modes of both chiralities.
