BackgroundExclusion of stroke is the focus of guidelines in the emergency department assessment of acute vertigo, especially with new‐onset atrial fibrillation (AF). Early diagnosis of vestibular neuritis (VN) is also important but may be deferred awaiting brain magnetic resonance imaging (MRI) for exclusion of stroke. This may delay potentially beneficial corticosteroid therapy.AimsTo highlight that VN can provoke acute AF.MethodsIn the course of a prospective study of acute vertigo in patients assessable within 24 h of admission, we encountered three patients with acute onset transient AF associated with VN. We performed a detailed neurological examination and quantitated the vestibulo‐ocular reflex (VOR) gain with video‐oculography. Brain MRI was performed in all patients.ResultsThere were two men and one woman, aged 58–66 (mean 61) years. All patients had typical non‐direction‐changing rotatory nystagmus and positive head impulse tests. The horizontal VOR gains ranged 0.38–0.62 (mean 0.47). Diffusion‐weighted MRI within 36 h was normal in all. AF reverted in all three within 24 h.ConclusionsAcute AF can be precipitated by vertigo such as in VN. In VN, the concurrence of acute AF may distract from the correct neurological diagnosis, delaying potentially beneficial corticosteroid therapy, especially if exclusion of stroke is dependent on MRI, which may be delayed.