Petronella Theodora Maria "Ellen" Bontje (born 11 June 1958 in Hilversum, North Holland) is an equestrian from The Netherlands, who won the silver medal in the Team Dressage Event at the 2000 Olympic Games in Sydney, Australia.

In the individual competition Bontje finished in sixth position.

[1] Eight years earlier, at the 1992 Olympic Games in Barcelona, Spain, Bontje was also a member of the Dutch team that won the silver medal in the Team Dressage Competition.

She competed in three Summer Games for her native country, starting at the 1988 Olympics in Seoul, South Korea.

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