The IKS Lach was a Klingon starship in service in the 2370s. During the Dominion War, it served as General Martok's wingship.

In 2374, the Lach docked at Starbase 375 for repairs to its hull plating. In order to avoid the Lach being down for weeks, the IKS Rotarran did not dock at the starbase, allowing the docking bay to be used to repair the Lach. (DS9 novelization: Call to Arms...)