  We propose new searches for axion-like particles (ALPs) produced in
flavor-changing neutral current (FCNC) processes. This proposal exploits the
often-overlooked coupling of ALPs to W bosons, leading to FCNC production of
ALPs even in the absence of a direct coupling to fermions. Our proposed
searches for resonant ALP production in decays such as $B\rightarrow
K^{(*)}a,\,a\rightarrow \gamma\gamma$ and $K\rightarrow \pi a, \,a\rightarrow
\gamma\gamma$ could greatly improve upon the current sensitivity to ALP
couplings to Standard Model particles. We also determine analogous constraints
and discovery prospects for invisibly decaying ALPs.
