  The aim of this Chapter is to provide an account of recent advances in the
first-principles modeling of ferroelectric oxide nanostructures. Starting from
a microscopic description of ferroelectricity in bulk materials and considering
then, successively, different kinds of nanostructures (films, multilayers,
wires, and particles), we try to identify the main trends and to provide a
coherent picture of the role of finite size effects in ferroelectric oxides.
