100 series may refer to:
Japanese train types
- 100 Series Shinkansen, a Japanese Shinkansen high-speed train type
- Choshi Electric Railway 100 series electric multiple unit
- Keisei AE100 series electric multiple unit
- KiHa 100 series diesel multiple unit
- Meitetsu 100 series electric multiple unit
- Tobu 100 series Spacia electric multiple unit
- 100-series highways (Nova Scotia), a series of arterial highways in the Canadian province of Nova Scotia
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