  We study the discovery potential for heavy axion-like particles (ALPs) and
the perspectives for determining their coupling properties at a muon collider.
Focusing on their couplings to the Standard Model (SM) gauge bosons $\gamma, Z,
W^\pm$, we show that a high-energy muon collider can substantially extend the
mass coverage, essentially reaching the kinematic limit of the collider energy.
The unique kinematics allow for non-ambiguous determination of the individual
coupling strengths. The associated production via $\mu^+\mu^-$ annihilation and
the VBF processes with the tagged outgoing muons can be utilized to verify the
CP property of the ALPs. We illustrate our results for a muon collider running
at 3 TeV and 10 TeV.
