This paper reports on the development of the Cultural Formulation Interview-Fidelity Instrument (CFI-FI) which assesses clinician fidelity to the DSM-5 Cultural Formulation Interview (CFI). The CFI consists of a manualized set of standard questions that can precede every psychiatric evaluation. It is based on the DSM-IV Outline for Cultural Formulation, the cross-cultural assessment with the most evidence in psychiatric training. Using the New York sample of the DSM-5 CFI field trial, two independent raters created and finalized items for the CFI-FI based on six audio-taped and transcribed interviews. The raters then used the final CFI-FI to rate the remaining 23 interviews. Inter-rater reliability ranged from .73 to 1 for adherence items and .52 to 1 for competence items. The development of the CFI-FI can help researchers and administrators determine whether the CFI has been implemented with fidelity, permitting future intervention research.