Introduction: Methylmercury (MeHg) can penetrate the blood-brain barrier and cause brain cell damage, also give impacts such as decreased vision, hearing loss, paresthesia, and ataxia. However, the impact of a low dose of MeHg exposure on neurological disorders is not well understood. This research is aimed to investigate the effect of a low dose of methylmercury (MeHg) exposure in the early symptoms and onset of neurological disorders measured by ataxia and function of cerebellum in Balb/c mice. Methods: This research was an experimental research with post-test only control group design. Fifteen Balb/c mice were randomly divided into 3 groups of control, MeHg1 (5 mg/kg body weight (BW)/day), and MeHg2 (10 mg/kg BW/day) all given orally treatment once a day for 17 days. Ataxia was observed using the Hind-Limb Clasping test and Ledge test methods. The cerebellum was separated and undergone Hematoxylin Eosin (HE) staining for histopathological analysis. Statistical tests used Fisher-Exact, One-way ANOVA, and Kruskal-Wallis tests. Results: The results showed a significant difference between the level of MeHg with the level of ataxia (p < 0.001; Fisher Exact test) and the number of intact Purkinje cells as an indicator of cerebellar histopathology changes (p = 0.001; One-way ANOVA test). The ataxia level was significantly correlated with histopathological features of the cerebellum in mice (p < 0.05; Kruskal-Wallis test). Conclusion: Low dose exposure of MeHg could induce ataxia and cerebellar dysfunction