Pandanus palustris ("Vacoas des marais") is a species of plant in the family Pandanaceae, endemic to Mauritius.

A tall (8–10 m), erect, solitary tree, with a large, dense rosette of slender, drooping, pale-green leaves.

The leaf margins are completely lined with tiny cream coloured spines, that often develop brown tips.

This species can also be distinguished from its closest relatives by its very large, round fruit-heads, which are partially enclosed in protective leafy bracts.

Similar to Pandanus pyramidalis, the joined portion of the drupes inside the fruit-head becomes light-yellow when ripe.