C25
- Acidithrix ferrooxidans
- Argon
- BSA C25 Barracuda
- Boeing VC-25
- C-25 highway (Spain)
- C25 road (Namibia)
- Caldwell 25
- Carbon Dioxide
- Carlsson C25
- Catalina 25
- Caudron C.25
- Cierva C.25
- Citroën C25
- Lockheed C-25 Altair
- MIG welding
- OMX Copenhagen 25
- Pancreatic cancer
- Siemens C25
- Vienna Game
- Waverly Municipal Airport