Bruce Roger Maslin (born 3 May 1946) is an Australian botanist.
Born in Bridgetown, Western Australia, he obtained an honours degree in botany from the University of Western Australia in 1967, then took up an appointment as a botanist with the Western Australian Herbarium. The following year he was conscripted to serve in the Vietnam War; he gave three years in National Service, serving in Vietnam in 1969. In 1970 he returned to his position at the Western Australian Herbarium, serving in that institution until 1987. During this time he was Australian Botanical Liaison Officer in 1977 and 1978; editor of Nuytsia from 1981 to 1983; and acting curator in 1986 and 1987. In 1987, Maslin was appointed a Senior Research Scientist, still within the Department of Environment and Conservation. He remains in that position to date.
A specialist in the genus Acacia, he has published around 250 Acacia taxa.