Mitromorpha granum is an extinct species of sea snail, a marine gastropod mollusk in the family Mitromorphidae.^[1]

The length of the shell attains 8 mm (0.31 in), its diameter 4 mm (0.16 in).

This extinct species is endemic to New Zealand and was found off the Whenuaturu Peninsula.

• Maxwell, P.A. (2009). Cenozoic Mollusca. pp. 232–254 in Gordon, D.P. (ed.) New Zealand inventory of biodiversity. Volume one. Kingdom Animalia: Radiata, Lophotrochozoa, Deuterostomia. Canterbury University Press, Christchurch.

• Marwick, J. "The Tertiary Mollusca of the Chatham Islands including a generic revision of the New Zealand Pectinidae." Transactions of the New Zealand institute. Vol. 58. No. 4. 1928.