This article presents a discourse analytic study of how the concept of impartiality is socially constructed by members of the development aid community through an examination of linguistic traits and patterns within (a) inter- and intraorganizational interactions and (b) relevant aid evaluation policy documents. A qualitative analysis of unstructured and semistructured interviews with development professionals in Japan and a content analysis of relevant evaluation policies and documents have revealed observable evidence of distinct institutional practices of impartiality via project evaluations. Most notably, in contrast to a notion of evaluator impartiality that is strengthened through the principle of independence, development professionals in Japan perceive evaluations (‘hyouka’) to be a fundamentally hierarchical construct in which evaluator impartiality can be strengthened or legitimized through authoritative or hierarchical means.