Leonhard may refer to:
- Leonhard Euler (1707-1783), Swiss mathematician and physicist
- Leonhard Rauwolf (1535-1596), German physician and botanist
- Leonhard Hutter (1563-1616), German theologian
- Karl Leonhard (1904 - 1988), German psychiatrist
- Jim Leonhard (1982- ), American Football Safety
- LEONHARD (2009- ), Oslo-based DJ collective