The United Nations Support Office in Somalia (UNSOS) was established on 9 November 2015, through UN Security Council Resolution 2245. UNSOS is a successor operation to the United Nations Support Office for AMISOM (UNSOA), which was established in 2009 (S/RES/1863 (2009) to provide logistical field support to the African Union Mission in Somalia (AMISOM). 

The core mission is to provide critical support to AMISOM, UNSOM and the Somali Federal Security Institutions to make them more effective in defeating enemies of peace and in creating the much needed space for political reconciliation, state formation and extension of government authority in Somalia.