Trachypterus rex-salmonorum Jordan & Gilbert, 1894 King-of-the-salmon (Trachipterus altivelis), is a species of ribbonfish in the family Trachipteridae.

Its common name comes from the legends of the Makah people west of the Strait of Juan de Fuca, which hold that this fish leads the salmon annually to their spawning grounds.

It is usually found in the open ocean to a depth of 900 meters (3,000 feet), though adults sometimes feed on the sea bottom.

In the Northern Hemisphere, the density of the eggs is greatest towards the southern extents of its range, suggesting a relationship between spawning and warmer water temperatures.

Known predators of small king-of-the-salmon include the bigeye thresher shark (Alopias superciliosus) and the longnose lancetfish (Alepisaurus ferox).