PECO is a British manufacturer of model railway accessories.
Peco or PECO may also refer to:
- PECO Energy Company, formerly the Philadelphia Electric Company, now a subsidiary of Exelon
- Panay Electric Company (PECO), an electric power distribution company in the Philippines
- peco (unit), the unit of measurement of the dielectric properties of concrete
- Asim Peco, linguist
- Pakistan Engineering Company (PECO), an engineering company in Pakistan
- PECO-InspX, a global manufacturer of Fill Level Monitoring, X-ray Inspection and related industrial systems
- Photoelectrochemical oxidation, a process by which incident light enables a semiconductor material to promote a catalytic oxidation reaction
- Peco (model), Japanese model, television personality, and singer