The International Workshops on Weak Interactions and Neutrinos have been organized regularly for the past 40 years at many venues in Africa, Asia, Europe and the United States. The goal of these Workshops is to offer the physics community a significant opportunity to assess the status of major topics within the field and initiate collaborative effort to address current challenges. The Workshops attract leading experimentalists and theorists, from all over the world, who take advantage of the occasion to work with colleagues on common problems.