Potamogeton acutifolius is a European species of aquatic plant in the family Potamogetonaceae, known by the common name sharp-leaved pondweed.

Sharp-leaved pondweed grows annually from turions and seed, producing rather lax plants branching near the surface with strongly compressed stems and long, rather grass-like leaves that are 35–100 mm long and 1.5–5 mm wide and dark green, often with a marked reddish or brownish tinge.

[3] In northeast Europe, DNA evidence indicates that hybrids with P. compressus are fairly frequent, but often overlooked because of the difficulty of reliably identifying them.

In Britain, P. acutifolius is almost exclusively restricted to shallow, circumneutral, species-rich ditches on lowland grazing marshes,[3][11] often with fairly high conductivity.

[12] Although there are some fairly strong populations remaining in Britain, these are vulnerable to changes in farming practice, pollution and sea level rise.