  While the QCD axion is often considered to be necessarily light ($\lesssim$
eV), recent work has opened a viable and interesting parameter space for heavy
axions, which solve both the Strong CP and the axion Quality Problems. These
well-motivated heavy axions, as well as the generic axion-like-particles, call
for explorations in the GeV mass realm at collider and beam dump environments.
The primary upcoming neutrino experiment, Deep Underground Neutrino Experiment
(DUNE), is simultaneously also a powerful beam dump experiment, enabled by its
multipurpose Near Detector (ND) complex. In this study, we show with detailed
analyses that the DUNE ND has a unique sensitivity to heavy axions for masses
between $20$ MeV and $2$ GeV, complementary to other future experiments.
