Dietes grandiflora, commonly named fortnight lily, large wild iris, African iris or fairy iris, is a rhizomatous perennial plant of the Iris Family (Iridaceae) with long, rigid, sword-like green leaves. This species is common in horticulture in its native South Africa, where it is often used in public gardens, beautification of commercial premises and along roadsides.

The blooms are white marked with yellow and violet, and are up to four inches (ten cm) in diameter. Dark markings are found at the base of the outer tepals. These are borne in abundance during summer, especially after rain. These flowers will last a couple of days and are then followed by 5 cm long green capsules that contain very dark brown seeds, dispersed when the capsule splits open.

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