Citizen voice is solicited in government to hold providers accountable, advance democratic values, and improve service delivery. Downstream citizen voice, such as complaints, can reveal pressure points, diverse needs, and failures in complex service ecosystems. However, theory and evidence on how noisy, unstructured citizen voice is mediated into policy and service arenas remain limited. Addressing this gap, this project looks to ombud institutions and related actors, which span citizen–state boundaries and policy networks. We use a qualitative approach to elaborate the concept of citizen voice mediation and to explore what strategies ombuds use to mediate downstream voice, and what drives these choices. Findings from interpretivist analysis of documents and interviews in Italy, the UK, and Argentina identify three outward mediation repertoires—authoritative‑targeted, facilitative‑collectivizing, and making information accessible and meaningful—expressed through directive (AR), hybrid (IT), and curatorial (UK) profiles. These strategies are shaped by different forms of ecosystemic fragmentation and actor capacities. The study advances a novel theorization of citizen voice mediation, develops positive propositions for testing, and deepens understanding of how voice can be strategically mediated to foster change in complex policy and service ecosystems.