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The blacknose shark, Carcharhinus acronotus, is a species of requiem shark, family Carcharhinidae, common in the tropical and subtropical waters of the western Atlantic Ocean. This species generally inhabits coastal seagrass, sand, or rubble habitats, with adults preferring deeper water than juveniles. A small shark typically measuring 1.3 m (4.1 ft) long, the blacknose shark has a typical streamlined "requiem shark" shape with a long rounded snout, large eyes, and a small first dorsal fin. Its common name comes from a characteristic black blotch on the tip of its snout, though this may be indistinct in older individuals.

Blacknose sharks feed primarily on small bony fishes and cephalopods, and in turn fall prey to larger sharks. Like other members of their family, they exhibit a viviparous mode of reproduction in which the developing embryos are sustained by a placental connection. The females give birth to 3–6 young in late spring or early summer either annually or biennually, after a gestation period of 8–11 months. This species is not known to attack humans, though it has been documented performing a threat display towards divers. It is of moderate commercial and recreational importance. The conservation status of this species has not been assessed by the International Union for Conservation of Nature (IUCN); in 2009, the US National Oceanic and Atmospheric Administration (NOAA) announced that populations of the blacknose shark off the United States are being overfished, and proposed new conservation measures.