  In this paper, we discuss a possibility of studying properties of dark energy
in long baseline neutrino oscillation experiments. We consider two types of
models of neutrino dark energy. For one type of models the scalar field is
taken to be quintessence-like and for the other phantom-like. In these models
the scalar fields couple to the neutrinos to give rise to a spatially varying
neutrino masses. We will show that the two types of models predict different
behaviors of the spatial variation of the neutrino masses inside Earth and
consequently result in different signals in long baseline neutrino oscillation
experiments.
