Hans Lissmann FRS (30 April 1909 – 21 April 1995) was a British zoologist of Ukrainian provenance, specialising in animal behaviour. He was elected a Fellow of the Royal Society in 1954, following breakthrough research with his assistant Kenneth E Machin identifying the electric field generated by the African Knife fish (Gymnarchus), and the uses which the fish makes of it. He was Reader, Department of Zoology, University of Cambridge, 1966–1977, then Reader Emeritus, and Director, Sub-Department of Animal Behaviour, 1969–1977.