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Common location of teratomas in children are sacrococcygeal, gonadal, mediastinal and retroperitoneal, but teratomas may also occur at very unusual locations. A six-month-old boy presented with a large swelling at his left lumbar region. He presented with gradually increasing lump at his back, involving more on left lumbar region and midline since birth. Clinical examination revealed a solitary, nontender, soft to firm, irregular mass, occupying more on his left lumbar and midline region and also crossing the midline. Radiological investigations revealed a well defined mass of 9.6 x 7.5cm, with bony elements and spina bifida at L1 and L2 levels. His Computed Tomography (CT) scan finding was consistent with mature teratoma. Complete surgical excision of the tumour was done without any difficulties. Histology of the excised tumour was conclusive of mature teratoma. His post-operative period was excellent, but he lost to follow-up after discharge.