Herman Montague Rucker Rupp (27 December 1872 – 2 September 1956) was an Australian clergyman and botanist who specialised in orchids.
Montague Rupp was educated at Geelong Grammar School as a boarder, where an uncle John Bracebridge Wilson, the naturalist, was headmaster.
Charles's parents died on the voyage to Australia or shortly before, and the boy was raised by William Frederic Augustus Rucker (1807–1882), another Prussian émigré.
In 1924 he decided to 'concentrate on the family which had always attracted me most — the orchids' and gave some 5000 other specimens to the University of Melbourne's botany school.
Rupp was awarded the Clarke Medal by the Royal Society of New South Wales in 1949 and the Australian Natural History Medallion by the Field Naturalists Club of Victoria in 1954.