Little Lon was the popular name for a slum and red-light district in Melbourne, Australia.
The area was roughly bounded by Lonsdale, Spring, Stephen (later Exhibition) and La Trobe streets. Little Lonsdale Street itself ran through the block, and the area was further divided by numerous narrow laneways. In the nineteenth century the area consisted of timber and brick cottages, shops and small factories and was home to an ethnically diverse and generally poor population. Today there are few reminders of the area's former notoriety.