  Given their intrinsic faintness, isolated neutron stars represent an elusive
target for optical astronomy. Up to date, an optical counterpart has been
identified only for a very tiny fraction of the overall population of more than
1000 radio pulsars. The HST contributions to the optical studies of isolated
neutron stars have been recently reviewed by Mignani et al. (2000) and by
Caraveo et al. (these proceedings). Here, we review its specific contribution
in the field of pulsar astrometry and kinematics.
