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Background: Guidance on assessment of the quantity and appropriateness of antifungal prescribing is required to assist hospitals to interpret data effectively and structure quality improvement programmes.Objectives: To achieve expert consensus on a core set of antifungal stewardship (AFS) metrics and to determine their feasibility for implementation.Methods: A literature review was undertaken to develop a list of candidate metrics. International experts were invited to participate in sequential web-based surveys to evaluate the importance and feasibility of metrics in the area of AFS using Delphi methodology. Three surveys were completed. Consensus was predefined as ≥80% agreement on the importance of each metric.Results: Eighty-two experts consented to participate from 17 different countries. Response rate for each survey was >80%. The panel included adult and paediatric physicians, microbiologists and pharmacists with diverse content expertise. Consensus was achieved for 38 metrics considered important to routinely include in AFS programmes, and related to antifungal consumption (n = 5), quality of antifungal prescribing and management of invasive fungal infection (IFI) (n = 24), and clinical outcomes (n = 9). Twenty-one consensus metrics were considered to have moderate to high feasibility for routine collection.Conclusions: The identified core AFS metrics will provide a framework to comprehensively assess the quantity and quality of antifungal prescribing within hospitals to develop quality improvement programmes aimed at improving IFI prevention, management and patient-centred outcomes. A standardized approach will support collaboration and benchmarking to monitor the efficacy of current prophylaxis and treatment guidelines, and will provide important feedback to guideline developers. [ABSTRACT FROM AUTHOR]