Maintenance Section Eighteen was a department at Starbase 11 that performed maintenance on Federation starships.

In 2267, as Maintenance Section Eighteen was working on the USS Intrepid, the USS Enterprise suffered damage from an ion storm and Captain James T. Kirk ordered a non-scheduled layover at the starbase. Commodore Stone ordered that the maintenance on the Intrepid be rescheduled so that the Enterprise, which was now at priority one, could be repaired. (TOS: "Court Martial")