Heil may refer to one of the following:
- An HVAC (Heating, Ventilation and Air Conditioning) home equipment manufacturer based in Lewisburg Tennessee. Company is a subsidiary of United Technologies Corporation (NYSE: UTX)
- Sieg Heil or Heil Hitler, a Nazi salute
- an Old English term for "luck" or "fortune", see halig
- Heil Heating & Cooling Products, a product line of International Comfort Products Corporation
- Heil Environmental Industries Limited, a subsidiary of Dover Corporation that manufactures garbage and recycling trucks.
- Heil Sound, a manufacturer of audio und studio equipment.
- Surname
- Hubertus Heil, German politician
- Jennifer Heil, Canadian freestyle skier
- Johannes Heil, German music producer
- Julius P. Heil, 30th governor of the State of Wisconsin
- Oskar Heil, inventor of the air motion transformer
- Reinhold Heil, German-American composer