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

[3] It was described by Christian Frederik Lütken in 1875, originally under the genus Xiphorhamphus.

[2] It inhabits the São Francisco and Paraná River.

It reaches a maximum standard length of 27 cm (11 in).

This Characiformes-related article is a stub.