| Ranzan | |
| Native Name Lang: | ja |
| Settlement Type: | Town |
| Pushpin Map: | Japan |
| Pushpin Map Caption: | |
| Coordinates: | 36.0565°N 139.3205°W |
| Subdivision Type: | Country |
| Subdivision Name: | Japan |
| Subdivision Type1: | Region |
| Subdivision Name1: | Kantō |
| Subdivision Type2: | Prefecture |
| Subdivision Name2: | Saitama |
| Subdivision Type3: | District |
| Subdivision Name3: | Hiki |
| Area Total Km2: | 29.92 |
| Population Total: | 17755 |
| Population As Of: | February 2021 |
| Population Density Km2: | auto |
| Timezone1: | Japan Standard Time |
| Utc Offset1: | +9 |
| Blank Name Sec1: | City Symbols |
| Blank1 Name Sec1: | - Tree |
| Blank1 Info Sec1: | Prunus mume |
| Blank2 Name Sec1: | - Flower |
| Blank2 Info Sec1: | Azalea |
| Blank3 Name Sec1: | - Bird |
| Blank Name Sec2: | Phone number |
| Blank Info Sec2: | 0493-62-2150 |
| Blank1 Name Sec2: | Address |
| Blank1 Info Sec2: | 1030-1 Sugiyama, Ranzan-machi, Hiki-gun, Saitama-ken 355-0211 |
right|thumb|250px|Ranzan Gorge is a town located in Saitama Prefecture, Japan., the town had an estimated population of 17,755 in 8150 households and a population density of 590 persons per km2.[1] The total area of the town is 29.92sqkm.
Ranzan is located in central Saitama Prefecture. The Higashimatsuyama Plateau extends to the central and northern parts of the town/
Ranzan has a humid subtropical climate (Köppen Cfa) characterized by warm summers and cool winters with light to no snowfall. The average annual temperature in Ranzan is 14.0 °C. The average annual rainfall is 1746 mm with September as the wettest month. The temperatures are highest on average in August, at around 25.6 °C, and lowest in January, at around 2.5 °C.[2]
Per Japanese census data,[3] the population of Ranzan peaked around the year 2000 and has declined since.
The villages of Sugaya and Nanasato were created within Hiki District, Saitama with the establishment of the modern municipalities system on April 1, 1889. The two villages merged on April 15, 1955 as Sugaya village, which was elevated to town status on April 15, 1967, taking the name of Ranzan.
Ranzan has a mayor-council form of government with a directly elected mayor and a unicameral town council of 13 members. Ranzan, together with the towns of Tokigawa, Ogawa and Namekawa, contributes one member to the Saitama Prefectural Assembly. In terms of national politics, the town is part of Saitama 10th district of the lower house of the Diet of Japan.
The economy of Ranzan is primarily agricultural; however, the town also have a large industrial park. Toppan Printing, Matsuya Foods and Myojo Foods are major employers.
Ranzan has three public elementary schools and two public middle schools operated by the town government. The town does not have a public high school, however, there is one private middle school and one private high school.