Cybister ('kybistētēr' = diver, tumbler), is a genus of beetle in family Dytiscidae.

[5] Adult males of the North American species have several ridges on the coxae of the hind legs, forming a stridulatory device.

[4] Cybister live in lentic (still fresh water) habitats that have vegetation.

The water beetle game (mul bang gae nori) is played in an oval, water-filled tank with vertical flanges along its inner edge and prizes on the tank rim.

[9] The swimming behaviour of C. lateralimarginalis has inspired (biomimetics) the design of a legged underwater robot.