Rai Valley is a rural settlement in Marlborough, New Zealand.

[5] The area may have been named for the Rangitāne chief, Rai kau moana.

A township grew up at Carluke, just to the west of Rai Valley locality, around a sawmill built by William Brownlee in 1907.

About 100 people worked at the mill, and a light railway connected it to a port on the Pelorus River.

It is part of the larger Marlborough Sounds West statistical area.