This article uses the concept of 'superdiversity' as a lens through which various conceptualisations of diversity in Norwegian early childhood education and care policies and professionals' understandings are made visible. Although Norwegian early childhood education and care is expected to highlight, value, and promote diversity and mutual respect, little has been written on how diversity is actually understood by professionals as part of early childhood education and care institutional practice. On the basis of interviews with 2 migration pedagogues, 10 early childhood education and care teachers, and 15 early childhood education and care teacher education students, the following conceptualisations of diversity were reconstructed: diversity as embodied by different children and families; diversity as a social context for every child's becoming; and diversity as equal participation. Each of these accounts involved ways of working with children and families from minority and majority backgrounds, and 'diversity as a social context for every child's becoming' seemed to be most in line with the Norwegian curriculum. The curriculum focuses on the process of formative development/becoming, which overlaps with and may be meaningfully supplemented by superdiversity. However, superdiversity as a sociological concept requires careful operationalisation in dialogue with the field and its empirics .