Paul Erdmann Isert (1756 – 21 January 1789) was a German botanist. Isert was born in Angermünde/Brandenburg, but educated in Berlin. He was the first scientist to identify the bird Red Bishop (Euplectes orix franciscana (Isert)'. He is also known for his attempts to end the Danish-Norwegian slave trade.He was appointed Chief Surgeon to Christiansborg (Osu, Accra) in Danish Guinea, arriving there in 1783.