Route 117 (国道117号 Kokudō hyakujūnana-gō) is a national highway connecting Nagano, Nagano and Ojiya, Niigata in Japan.
- 1953-05-18 - Second Class National Highway 117 (from Nagano to Ojiya)
- 1965-04-01 - General National Highway 117 (from Nagano to Ojiya)
- In Nagano City, from Nakagosho intersection to Nishiowaribe intersection: Route 19
- In Nagano City, Nishiowaribe intersection to Asano intersection: Route 18
- In Nagano City, Higashiwada intersection to Yanagihara-Kita intersection: Route 406
- In Iiyama City, Komaki-bashi kita intersection to Ario intersection: Route 292
Municipalities passed through