Gero (下呂市, Gero-shi) is a city located in Japan's Gifu Prefecture.

[3] Per Japanese census data,[9] the population of Gero has declined over the past 50 years.

During the post-Meiji restoration cadastral reforms, the area was organised into Mashita District, Gifu.

The village of Gero was created on July 1, 1889, with the establishment of the modern municipalities system.

Gero has a mayor-council form of government with a directly elected mayor and a unicameral city legislature of 14 members.

Besides those in hotels, there are many inexpensive and convenient onsens located near railway stations, residential areas, and commercial centers up and down the valley.