Exhibit 21

Wholly Owned Subsidiaries and Joint Ventures

Wholly Owned Subsidiaries

Donaldson Australasia Pty. Ltd.
Wyong, Australia Ultrafilter Pty. Ltd.
Nunwaiding, Victoria, Australia Donaldson Filtration Österreich, GmbH
Wien, Austria Donaldson Europe, b.v.b.a.
Donaldson Coordination Center, b.v.b.a.
Donaldson Belgie, b.v.b.a.
Leuven, Belgium Donaldson do Brasil
Equipamentos Industriais Ltda
Saõ Paulo, Brazil Donaldson Canada, Inc.
Athens, Ontario, Canada Donaldson Far East Ltd.
Hong Kong, S.A.R., China Donaldson (Wuxi) Filters Co., Ltd.
Wuxi, China Donaldson Czech Republic s.r.o.
Klasterec nad Ohri, Czech Republic Donaldson Industrial CR - Konzern s.r.o.
Kadan, Czech Republic Donaldson Filtration CR - Konzern s.r.o.
Prague, Czech Republic Donaldson Scandinavia a.p.s.
Horsholm, Denmark Donaldson, s.a.s.
Domjean, France Donaldson France, s.a.s. Financiere de Segur s.a.s.
Le Bozec Filtration & Systems, s.a.s.
Paris, France Ultrafilter s.a.s.
Vigny, France Donaldson GmbH
Torit DCE GmbH
Dulmen, Germany Donaldson Filtration Deutschland GmbH
Haan, Germany Ultratroc GmbH
Flensburg, Germany Donaldson Filtration Magyarorszag Kft.
Budapest, Hungary Donaldson India Filter Systems Pvt. Ltd.
New Delhi, India P.T. Donaldson Systems Indonesia
P.T. Donaldson Filtration Indonesia
Jakarta, Indonesia Donaldson Italia s.r.l.
Ostiglia, Italy

Nippon Donaldson Ltd.
Tokyo, Japan Donaldson Company Inc. (Luxembourg) SCS
DLXH S.a.r.l.
Luxembourg City, Luxembourg Donaldson Filtration
(Malaysia) Sdn. Bnd.
Selangor Darul Ehsan, Malaysia Donaldson, S.A. de C.V.
Prestadora de Servicios Aguascalientes, S. de R.L. de C.V.
Aguascalientes, Mexico Donaldson Torit, B.V.
Donaldson Nederland B.V.
Almere, Netherlands Donaldson Filtration Norway a.s.
Moss, Norway Donaldson Filtration (Philippines) Inc.
Muntinlupa City, Philippines Donaldson Polska Sp. z.o.o.
Warsaw, Poland Donaldson Filtration (Asia Pacific) Pte. Ltd.
Singapore Donaldson Filtration Slovensko s.r.o.
Bratislava, Slovakia Donaldson Filtration Systems (Pty) Ltd.
Cape Town, South Africa Donaldson Korea Co., Ltd. Seoul, South Korea Donaldson Iberica Soluciones en Filtracion, S.L. Barcelona, Spain Donaldson Filtros Iberica S.L.
Madrid, Spain Ultrafilter S.L.
Terrassa, Spain Donaldson Schweiz GmbH
Aarau, Switzerland Donaldson Taiwan Ltd.
Taipei, Taiwan Donaldson Filtration (Thailand) Ltd.
Nothaburi, Thailand Donaldson (Thailand) Ltd.
Rayong, Thailand Donaldson Filtre Sistemleri
Ticaret Limited Sirketi
Istanbul, Turkey Donaldson Filter Components Ltd.
Donaldson UK Holding Ltd.
DFCH Ltd.
Hull, United Kingdom Donaldson Filtration (GB) Ltd. DCE Group Ltd.
Ultrafilter Ltd.
Leicester, United Kingdom Donaldson Capital, Inc.
ASHC, Inc.
Minneapolis, MN USA Aerospace Filtration Systems, Inc. St. Charles, MO USA

Joint Ventures

Advanced Filtration Systems, Inc.

Champaign, Illinois

Advanced Filtration Services, Inc.

Las Vegas, Nevada

AFSI Europe s.r.o.

Klasterec, Czech Republic

Ultrafilter Pty. Ltd.

India

P.T. Panata Jaya Mandiri

Jakarta, Indonesia

Rashed Al-Rashed & Sons —

Donaldson Company Ltd.

Dammam, Saudi Arabia