The auxiliary replicator system is a system aboard a Federation starship that provides the replicators with energy.

When Geordi La Forge was brainwashed by the Romulans in late 2367, he routed enery from the auxiliary replicator systems to a cargo transporter in cargo bay 4 in order to tranport weapons down to rebels on Krios and not be detected. (TNG: "The Mind's Eye")