Pedicularis rainierensis is a species of flowering plant in the family Orobanchaceae commonly known as Mount Rainier lousewort.

It is endemic to the vicinity of Mount Rainier in Washington state.

[4] Pedicularis rainierensis is a fibrous-rooted, perennial herb that is 1.5-4 decimeters long.

The fruits' capsules are hairless, flattened, and often slighted winged.

The flowers have a spikelike raceme topping an unbranched stem.