Research has identified structural differences between monolinguals and bilinguals in brain regions underlying language, and memory. This is consistent with the Declarative/Procedural language model, which proposes that hippocampal-based and basal ganglia-based networks subserve language learning and processing.Whole-brain resting-state functional connectivity (FC) of bilateral hippocampi and caudate nuclei was analyzed in 117 participants with diverse multilingual language experience, to assess relationships of FC with performance on verbal declarative memory and procedural memory tasks, and the interaction between multilingual experience and these relationships.Higher declarative memory performance was associated with increased FC of bilateral hippocampi with bilateral thalamus and caudate nuclei, which are critical for memory-guided attention and episodic memory, respectively. Higher procedural memory performance was associated with increased FC of bilateral caudate nuclei with left postcentral, precentral gyri and middle frontal gyrus, regions involved in action behavior and cognition.We also found an interaction between multilingualism, declarative memory and the FC between the right hippocampus and the bilateral precuneus, supramarginal gyrus, thalamus, caudate nucleus and cerebellum. There was also such an interaction between FC of the left hippocampus and bilateral posterior cingulate cortex, precuneus and left cerebellum. The precuneus and supramarginal gyrus are involved in episodic memory retrieval and verbal working memory, respectively. Previous work has demonstrated a relationship between grammar learning and FC between the right hippocampus and cerebellum.These findings have important implications for our understanding of the relationship between multilingualism and memory skills, as well as the underlying patterns of FC in the brain during rest.