  We study the prospects of searching for leptophilic gauge bosons (LGBs) at
the beam dump experiment using $e^\pm$ beams of International $e^+e^-$ Linear
Collider (ILC). We consider LGBs in association of $U(1)_{e-\mu}$,
$U(1)_{e-\tau}$, and $U(1)_{\mu-\tau}$ gauge symmetries, which are assumed to
be light and long-lived. Utilizing the energetic electron and positron beams of
the ILC, we show that the ILC beam dump experiment can cover the parameter
regions which have not been explored before. We also discuss the possibility of
distinguishing various models.
