Embodiments of systems and methods for high-availability (HA) management networks for High Performance Computing (HPC) platforms are described. In some embodiments, an HPC platform may include a first Baseboard Management Controller (BMC) having a first network port; and a hardware accelerator comprising a second BMC having a second network port, where at least one of: (a) the first BMC is configured to share the first network port with the second BMC in response to a determination that the second network port has failed or has insufficient bandwidth, or (b) the second BMC is configured to share the second network port with the first BMC in response to a determination that the first network port has failed or has insufficient bandwidth.