Social work is a mostly discursive practice, comprised of the verbal and written interactions between service users, social workers, social work managers and supervisors and numerous external agencies. The words used to describe service users and service delivery are therefore important. These words change over time, and new words come into use. With the introduction of New Public Management, new concepts and ideas were introduced to social work service delivery and practice and new words became embedded in the social work lexicon. One of the new words that emerge in both the authors’ research with social work agencies is ‘transparency’. In this article, a critical thematic analysis of the meanings of transparency as it is used in recent social work research literature and commentary is presented. Transparency is explored in relation to how it is used, when it is used, by whom and in relation to what (and who), from the macro-level of social work agencies and governments to the micro-level of individuals as practitioners and service users. In problematising transparency, a rationale for future research is proposed about what transparency means, and could mean, in the context of social services provision and, in particular, for service users.