RMNS Allal Ben Abdellah is a corvette in service with the Royal Moroccan Navy. She is the second ship of her class of Sigma Frigate 9813 developed by Damen Group. The basic design of the Sigma Patrol Series can vary as the hull segments are designed as components. Ships can vary in the number of hull segments and in the order in which they are placed. Sigma stands for Ship Integrated Geometrical Modularity Approach. The ship’s main dimensions are named in the types itself, SIGMA 9813 stands for 98 metres long and with a beam of 13 metres. On 6 February 2008, Morocco signed a USD$1.2 billion contract with Schelde Naval Shipbuilding for two SIGMA 9813 and one SIGMA 10145, which are modified versions of the existing Sigma-class design.
A subsequent contract was signed on 1 April 2008 with Thales Nederland for the supply and installation of the command and control and sensor package for the ships. The package included TACTICOS combat management system, SMART-S Mk2 surveillance radar, LIROD Mk2 tracking radar, Thales KINGKLIP sonar system, IFF system, Integrated communication system comprising external communication system and FOCON internal communication system, two Target Designation Sights, VIGILE ESM system, SCORPION ECM system, and the integrated navigation system. On 8 September 2012, after successful sea trials and finishing of outfitting details, RMNS Allal Ben Abdellah was transferred to the Royal Moroccan Navy.