  We study the superradiance effect in a class of scalar-tensor Horndeski
theory. We first study the dynamics of a massive charged scalar wave scattered
off the horizon of a Reissner-Nordstr\"om black hole which except its canonical
coupling to gravity it is also coupled kinetically to curvature. We find that a
trapping potential is formed outside the horizon of a Reissner-Nordstr\"om
black hole, due to this coupling, and as the strength of the new coupling is
increased, the scattered wave is superradiantly amplified, resulting to the
instability of the Reissner-Nordstr\"om spacetime. We then considered the
backreacting effect of the scalar field coupled to curvature interacting with
the background metric and we study the superradiant effect and find the
superradiance conditions of a massive charged wave scattered off the horizon of
a Horndeski black hole.
