Taller women have a slightly higher risk of ovarian cancer, according to a review of studies.
Obesity is also a risk factor among women who have never taken HRT, say international researchers.
Previous studies have suggested a link, but there has been conflicting evidence.
The latest research, published in the journal PLoS Medicine, analysed all worldwide data on the topic.
It looked at 47 epidemiological studies in 14 countries, including about 25,000 women with ovarian cancer and more than 80,000 women without ovarian cancer.
Lead researcher Prof Valerie Beral of the Oxford University Epidemiology Unit told the BBC: "By bringing together the worldwide evidence, it became clear that height is a risk factor."
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