  I discuss top quark production in hadronic collisions. I present the
soft-gluon resummation formalism and its derivation from factorization and
renormalization-group evolution, and two-loop calculations of soft anomalous
dimensions in the eikonal approximation. I discuss the contributions of
next-to-next-to-leading order (NNLO) soft-gluon corrections to the total cross
sections and top-quark transverse momentum and rapidity distributions for
top-antitop pair production, and for single-top production in the $t$ and $s$
channels and in association with a $W$ boson or a charged Higgs boson.
