Oral title: First large scale Herbig-Haro jet driven by a proto-brown dwarf Oral abstract: We report the discovery of a new Herbig-Haro jet, HH1165, driven by a proto-brown dwarf. HH1165 has a projected length of 0.23pc, ten times larger than all known brown dwarf jets. The uniqueness of HH1165 is that it shows the well-known characteristics of a collimated bent C-shape, multiple shock knots, bright reflection nebulosity, and bow-shocks at the jet ends, as seen in parsec-length protostellar HH jets. This discovery demonstrates that large-scale HH jets can be driven by sub-stellar objects, and shows the robustness of models on how jets are launched and interact with the environment.