The Horn of Africa is currently facing with multidimensional challenges with critical impacts on the political, military, economic and social domains. Intra- and inter-state conflicts, terrorism, economic decline, food insecurity and migration are among the most significant challenges affecting the region. In order to deal with these challenges, regionalism and regional organizations play an important role, covering cooperation in security, the economy, environmental and social development. The NSD-S HUB and the African Centre for the Study and Research on Terrorism (ACSRT) organized a workshop on 23 May 2023 in Algiers, Algeria to discuss regional cooperation in the Horn of Africa. The following report contains the discussed topics of the workshop.