Johann Gottlieb Otto Tepper (1841 – 16 February 1923), known as Otto or J. G. O. Tepper, was an entomologist in South Australia; for much of his career with the South Australian Museum.
Tepper was born in Neutomischel, in Prussian Poland, the eldest son of Johann Christoph Tepper (c. 1815 – 14 November 1891), and Johanne Wilhelmine Tepper, née Protsch, and emigrated with them aboard Gellert, arriving in South Australia in 1847. They settled at Lyndoch, where he was educated before receiving tuition under Dr. Carl Muecke.
He became master of a small country school, then joined the Education Department and taught at Monarto, Nuriootpa and Clarendon.
In 1883 he was appointed natural history collector to the South Australian Museum and from 1888 until his retirement, on 30 June 1911 as entomologist, for which he gave valued service. He was a longtime member of the Royal Society, and a foundation member and several times president, of the Field Naturalists Society. He was elected a Fellow of the Linnean Society of London in 1879, was a Life Fellow of the Society of Science, Letters and Art, London, and an active member of around thirty the learned societies including the American Association for the Advancement of Science. He was a correspondent and friend of the meteorologist Clement Wragge.
(Johann Gottlieb) Otto Tepper (1841 – 16 February 1923) married Jane Brock ( – ) on 22 April 1867
They had a home at Somerset Place, Norwood