Recto-vaginal fistula is well known to occur in association with imperforate anus. We describe the case of an isolated "H-type" recto-vaginal fistula with no other anorectal abnormalities. The patient presented at 2 months of age with a vulval abscess and passing faeces per vaginum. Unilateral renal agenesis was also seen in this patient. We are unaware of any previous reports in the English-language literature of this isolated abnormality.