Here, we report a combined experimental and computational study of the fluorite-structured fluoride-ion conductor, cubic (c-)BaSnF 4 . We find that c-BaSnF 4 exhibits both site-occupational disorder, due to Ba/Sn cation mixing, and dynamic orientational disorder, due to Sn stereoactive lone pairs. The combination of these two forms of host-framework disorder within an ionconducting material makes c-BaSnF 4 a particularly interesting focus of study. We show that these two forms of disorder are coupled and that together they strongly influence the structure and dynamics of the mobile fluoride ions. The fluoride ion substructure is highly disordered, with 1/3 of fluoride ions occupying "interstitial" sites, due to lone-pair repulsion of fluoride ions in highly tin-coordinated sites. Fluoride ion dynamics are strongly dependent on the local cation environment and are cou- pled to dynamical reorientations of neighbouring Sn lone pairs. Our study provides new insight into the rich structural and dynamical behaviour of fluoride-ion conducting c-BaSnF 4 and how this arises from the unusual combination of coupled site-occupation and lone-pair-orientation host framework disorder.