Potamogeton amplifolius, commonly known as largeleaf pondweed or broad-leaved pondweed, is an aquatic plant of North America.

This perennial plant grows from rhizomes and produces a very slender, cylindrical, sometimes spotted stem up to a meter or so long.

Submersed leaves are up to 20 centimeters long by 7 wide and may be folded along their midribs.

The submersed leaves have more veins than do those of other pondweed species, up to 49.

The inflorescence is a spike of many flowers rising above the water surface on a thick peduncle.