Long Valley may refer to:

Long Valley (Antarctica)

Long Valley Caldera in California

Long Valley, California, former name of Greenwood, El Dorado County, California

Long Valley, Hong Kong

Long Valley, New Jersey

Long Valley, South Dakota

Long Valley, Hampshire, England

Long Valley (Lake County, California)

Long Valley (Nevada)

Long Valley (Kane County, Utah), stretching along US-89 from Long Valley Junction (SR-14) south to Mt. Carmel Junction (SR-9)