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

[1] It was described by Naércio Aquino de Menezes in 1969.

It inhabits the Amazon River basin, at a pH range of 5.5-7.2.

It reaches a maximum standard length of 23.3 cm (9.2 in).

[1] A. altus feeds off of bony fish.