BACKGROUND: Field Epidemiology Training Programs (FETPs) aim to develop a skilled public health workforce through applied competency-based learning. With 98 programs globally and over 20,000 graduates, these programs play a crucial role in disease preparedness and response activities around the world. Despite their importance, there have been few published evaluations. This paper presents the results of a consensus-building process to develop a preferred array of indicators for evaluating the outputs, outcomes, and impacts of FETPs. METHODS: We conducted a modified Delphi study to reach consensus on preferred evaluation indicators for FETPs. An initial list of evaluation indicators were identified from literature reviews and consultations with impact evaluation experts and FETP professionals. A modified Delphi process was subsequently employed, involving two rounds of surveys and a final expert review meeting, to reach consensus on indicators. The Delphi panel included 23 experts representing diverse global regions and FETP roles. RESULTS: Consensus was reached to include 134 evaluation indicators in the final impact evaluation framework. These indicators were grouped as output, outcome, and impact indicators. CONCLUSIONS: This study presents the first FETP impact evaluation framework with a comprehensive list of evaluation indicators for FETPs. This list of indicators is intended as a resource to promote and enhance the evaluation of FETPs and thus improve these important training programs which aim to strengthen national, regional and global health security.