United Nations Operation in Somalia I (UNOSOM I) was the first part of a United Nations (UN) sponsored effort to provide, facilitate, and secure humanitarian relief in Somalia, as well as to monitor the first UN-brokered ceasefire of the Somali Civil War conflict in the early 1990s.

The operation was established in April 1992 and ran until its duties were assumed by the UNITAF mission in December 1992. Following the dissolution of UNITAF in May 1993, the subsequent UN mission in Somalia was known as UNOSOM II.