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Nancy Pelosi and Leonardo DiCaprio attended the funeral of conservationist Jane Goodall. (AP: Mark Schiefelbein)

Environmental conservationists, including actor Leonardo DiCaprio and Indigenous community representatives, have gathered in Washington, DC to pay tribute to celebrated primatologist Jane Goodall.

Dr Goodall, who died in October at the age of 91, transformed the study of chimpanzees and became one of the world's most revered wildlife advocates during her decades-long career.

Leonardo DiCaprio honoured his late friend during the service. (Reuters: Evelyn Hockstein)

"May we all honour her by carrying forward that same fierce belief that we can do better, that we must do better, and that we have a responsibility to protect this beautiful natural world we all share," DiCaprio said in his remarks at the Washington National Cathedral service.

High-profile mourners who counted themselves among Dr Goodall's friends attended the funeral at Washington National Cathedral. (AP: Mark Schiefelbein)

Former house speaker Nancy Pelosi and chef Jose Andres attended the funeral. (AP: Mark Schiefelbein)

Dr Goodall could be clear-eyed and blunt "about the greed and relentless consumption of our species", the Hollywood star said of his late friend.

"But beneath that fierce honesty was an unwavering faith that every voice matters, that we are all connected to the living world, and that each of us can make a difference," DiCaprio said.