Long Mountain may refer to:

Geography

China

• Mount Long (陇山), the southern section of Mount Liupan within Shaanxi province, which defines the western end of the Guanzhong region

Jamaica

• Long Mountain (Jamaica), a mountain in the Kingston area

United Kingdom

• Long Mountain (Powys), on the borders of Powys, Wales and Shropshire, England

United States

• Long Mountain (Hampshire County, Massachusetts)
• Long Mountain, just west of Tuxedo, North Carolina
• Long Mountain in Hardy County, West Virginia

Other

• Long Mountain (radar), Taiwanese air defense and BMD radar