Knatts Valley is a hamlet in the civil parish of West Kingsdown, in the Sevenoaks district, in the county of Kent, England.

It was originally a rural community consisting mainly of several smallholdings: the principal farms being Knatts Farm (sheep), giving its name to the area; and Maplescombe Farm (cattle). One settlement in the valley is Romney Street; the word street meaning hamlet in these parts of Kent. To the east there is a development of housing within a wooded area, mainly of detached housing, and to the west is a similar development — "East Hill". There is a golf course and a residential caravan park. Here is also an unlicensed airstrip, being part of Romney Street Farm, with a north–south grass runway east of Upper Wood.

51°20′00″N 0°14′53″E / 51.3332°N 0.2481°E / 51.3332; 0.2481