Companies[]
- J.J. Thomas - manufactured Ford tractor conversions
- Perley A. Thomas Car Works - streetcar manufacturer
- Thomas Built Buses - bus manufacturer, part of Daimler AG
- Thomas Dennis Company LLC - bus manufacturer of USA, part
- Thomas Equipment - manufacturer of Skid Loaders
- Thomas Green & Sons - manufacturer of road rollers and lawn mowers
- Thomas Harrington Ltd - former English Coachbuilder
- Thomas B. Jeffery Company - auto manufacturer
- Thomas Smith & Sons (Rodley) Ltd - manufacturer of cranes and excavators
- Thomas Tilling Group - former major bus operator in the United Kingdom