Nitida, Nitidum and Nitidus are forms of the Latin for "bright, shining, sleek, blooming, smart" and may refer to:

Nitida:

• Nitida saga, a 14th-century Icelandic medieval story

Nitidus:

• Barbichthys nitidus, a junior synonym of B. laevis
• Eleutherodactylus nitidus, a species of frog in the family Leptodactylidae
• Emmelichthys nitidus, a rover species found at depths of between 100 and 500 m
• Euryoryzomys nitidus, a rodent species in the genus Euryoryzomys of family Cricetidae
• Hemicoelus nitidus, a species of beetles in the genus Hemicoelus of the family Anobiidae
• Lichen nitidus, a chronic inflammatory disease of unknown etiology
• Limnonectes nitidus, a species of frog in the family Ranidae
• Liolaemus nitidus, known as the shining tree iguana is a species of lizard in the family Iguanidae
• Nassarius nitidus, a species of sea snail, a marine gastropod mollusk in the family Nassariidae
• Petalonyx nitidus, a species of flowering plant in the family Loasaceae known as shinyleaf sandpaper plant
• Phymatodes nitidus, a species of longhorn beetle
• Rhabdoblennius nitidus, a species of combtooth blenny found in coral reefs in the western Pacific Ocean
• Sphoeroides nitidus, a species in the family Tetraodontidae, or pufferfishes
• Stemonoporus nitidus, a species of plant in the family Dipterocarpaceae
• Zonitoides nitidus, species of small, air-breathing land snail in the family Gastrodontidae

Nitidum

• Leptospermum nitidum, the shining tea-tree, a shrub species endemic to Tasmania
• Pisidium nitidum, the shining pea clam, a freshwater clam species
• Strioterebrum nitidum, the shiny Pacific auger, a sea snail species
• Zanthoxylum nitidum the shiny-leaf prickly-ash, a flowering plant species
• Meioceras nitidum, a sea snail species

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