Geissorhiza splendidissima, the blue pride-of-Nieuwoudtville, is a plant species of geophyte in the family Iridaceae.

The zygomorphic flowers with unilateral, declinate stamens and dark red-brown pollen are unusual, as is the somewhat ribbed sheath of the uppermost leaf.

[3]Geissorhiza splendidissima is found in damp areas of stony clay flats in Renosterveld vegetation on the Kouebokkeveld Mountains around Nieuwoudtville.

Geissorhiza splendidissima is listed in the Red List of South African Plants as Vulnerable due to having lost 80% of its habitat through farming encroachment, in addition to the fact that it is localised to a small area surrounding Nieuwoudtville.

[1] The Namaqua rock rat and the Cape porcupine eat G. splendidissima.