Recent international trends in Adult Education (AE) mirror the diverse realities this field is experiencing around the world. This article discusses the trend towards democratization through a revision of existing knowledge in three main domains: theory, research, and practice. First, a theoretical framework of democratization as applied in AE will be outlines. Second, recent research developments will be reviewed as they inform the process of democratization through Adult Education which is occurring in different contexts. Third, an analysis of a specific process of democratization in the AE practice will be carried out, based on the situation in Spain.