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Standing approximately three meters tall and weighing approximately 210 kilograms (by Earth standards; given Pandora's lower gravity, the average Na'vi on their home moon weighs "only" about 160 kilograms), the Na'vi bear only a passing resemblance to humans: the most noticeable difference being their bluish-blue skin (its color comes from a cyanine pigment, whereas Na'vi blood is red), with a complex pattern of darker stripes and spots, overlaid with a unique pattern of bioluminescent markings for identification.

The Na'vi also have a long, thin tail—it aids balance while running and jumping, and also serves to express emotions. The Na'vi themselves don't always control its movements, giving rise to the saying, "Watch your tail!"—and mobile, pointed ears, huge golden-yellow eyes, and fangs more pronounced than those of humans, giving the natives of Pandora a predatory appearance. Their bodies are muscular yet graceful: their waists are elongated, their shoulders broad, so that the overall silhouette resembles an inverted, pointed triangle. Their limbs are long, their palms and feet oblong, and they have four fingers on each hand and toe. The Na'vi's neck is quite long, powerful, but surprisingly mobile, and the structure of their skulls clearly shows feline features: they have flat noses without a central ridge and very large eyes with an inhuman slant, hypersensitive to various ranges of light.