This paper turns to the work of the Portuguese sociologist Boaventura de Sousa Santos and explores how a set of concepts he developed over the years may constitute valuable tools in the task of decolonising and pluriversalising Human Rights Education (HRE). Informed by decolonial theory, Santos highlights that the struggle for global social justice is inseparable from the struggle for cognitive justice, namely, the recognition of epistemic diversity. This paper makes a contribution to the efforts that view the pluriversalisation of HRE as inextricable parts of the wider task of decolonising knowledge and education and struggling for social justice.