Ianto may refer to:
- Ianto Davies (c. 1892 – c. 1946), Welsh international rugby union full back
- Ianto Evans, applied ecologist, landscape architect, inventor, writer, social critic, and teacher
- Ianto Morgan, a fictional character in the Penguin Modern Classic "How Green was my Valley" by Richard Llywellyn.
- Ianto Jones, a fictional character in the BBC television series Torchwood