Potamogeton octandrus is an aquatic plant species in the genus Potamogeton. It is found in slow moving fresh water.
This is a common plant in lakes and ponds. It is known from Africa, Asia (Russian Far East, Mongolia, Korea, Japan, China, Taiwan, Pakistan, India, Nepal, Bhutan, Myanmar, Thailand, Vietnam (type), Indonesia (type of P. javanicus), and Papua New Guinea), and Australia (type of P. tenuicaulis).