  We propose a new scenario of baryogenesis, in which annihilation of axion
domain walls generates a sizable baryon asymmetry. Successful baryogenesis is
possible for a wide range of the axion mass and decay constant, $m \simeq 10^8
-10^{13}$ GeV and $f \simeq 10^{13} - 10^{16}$ GeV. Baryonic isocurvature
perturbations are significantly suppressed in our model, in contrast to various
spontaneous baryogenesis scenarios in the slow-roll regime. In particular, the
axion domain wall baryogenesis is consistent with high-scale inflation which
generates a large tensor-to-scalar ratio within the reach of future CMB B-mode
experiments. We also discuss the gravitational waves produced by the domain
wall annihilation and its implications for the future gravitational wave
experiments.
