Fernanda Keller (born 4 October 1963) is a professional triathlete from Brazil who was the first Brazilian woman to medal in the Ironman Triathlon World Championships.

She is the only female athlete in the world to have taken part in 23 consecutive years and to have achieved 14 top-ten finishes in this race.

Thirty years later, just a few days after her 50th birthday in 2013, she participated in Ironman Hawaii for the 24th time; completing it in 11:03 hours and placing sixth out of 55 women in her age group.

Her Instituto Fernanda Keller, a social institution for 700 adolescents from 7 up to 18 years, has been in business since she founded it in September 1998.

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