Acestrorhynchus falcatus is a species of fish in the family Acestrorhynchidae.

[2] It was described by Marcus Elieser Bloch in 1794, originally under the genus Salmo.

[1] It inhabits the Orinoco and Amazon Rivers in the regions of Suriname, Guyana, and French Guiana.

[2] Acestrorhynchus falcatus feeds on finfish.

[3] It is of minor interest to commercial fisheries.