Hans-Voldemar Trass (2 May 1928 – 14 February 2017) was an Estonian ecologist and botanist. He has been a member of the Estonian Academy of Sciences since 1975. He was the president of the Estonian Naturalists' Society in 1964–1973 and 1985–1991. In 1992 Trass was awarded the Acharius Medal by the International Association for Lichenology.
Trass was married to Estonian actress Raine Loo. The couple had a son, composer and organist Toomas Trass.
Trass died on 14 February 2017, aged 88.
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