Rotax is the brand name for a range of internal combustion engines developed and manufactured by the Austrian company BRP-Rotax GmbH & Co KG, in turn owned by the Canadian Bombardier Recreational Products (BRP). Under the Rotax brand, the company is one of the world's largest producers of light piston engines.

Bombardier Transportation Austria GmbH is an Austrian subsidiary company of Bombardier Transportation located in Vienna, Austria.