<Page> EXHIBIT 21 WOODWARD GOVERNOR COMPANY SUBSIDIARIES OF THE REGISTRANT Baker Electrical Products, Inc. Delaware, USA Woodward FST, Inc. Delaware, USA Woodward Foreign Sales Corporation St. Thomas, U.S. Virgin Islands Woodward HSC, Inc. New York, USA Woodward International, Inc. Delaware, USA Woodward Tianjin Controls Company Limited Tianjin, China Woodward Governor de Mexico S.A. de C.V. Mexico City, Mexico Woodward Governor Asia/Pacific PTE. LTD. Singapore, Republic of Singapore Woodward Governor France S.A.R.L. Venissieux, France Woodward Governor Germany GmbH Aken, Germany Woodward Governor GmbH Lucerne, Switzerland Woodward Governor India PTE. LTD. New Delhi, India Woodward Governor Nederland B.V. The Netherlands Woodward Governor Poland, Limited Warsaw, Poland Woodward Governor (Japan) Ltd. Japan Woodward Governor (Quebec) Inc. Quebec, Canada Woodward Governor (Reguladores) Limitada Brazil Woodward Governor (U.K.) Limited United Kingdom <Page> Woodward Governor Company Leonhard-Reglerbau GmbH Stuttgart, Germany