Primary ovarian carcinoid tumours of the ovary are rare and represent less than 0.1% of ovarian malignancy. The evidence to guide treatment and prognosis of these tumours is limited. We report a case of primary ovarian mucinous carcinoid tumour, of the atypical category, in a 34-year-old nulliparous woman. Only three such cases have previously been reported. At four years from presentation, she has no signs of metastatic disease, despite delayed primary surgery and then initial conservative management. At present surgical excision with close follow-up appears to be the management of choice. This case adds to the body of evidence and demonstrates a possible good prognosis with non-aggressive behaviour in the atypical mucinous carcinoid group.