1E is a privately owned software company based in the United Kingdom. 1E has offices in London, New York, Frankfurt, Paris, and Noida. The company develops automated software solutions to address complexity, management costs and power consumption. 1E has developed products to reduce the energy consumption of IT hardware, such as personal computers, monitors and servers.

1E was founded in 1997 by three former Microsoft contractors, Sumir Karayi, Phil Wilcock, and Mark Blackburn, who each contributed £500 to start the company. Karayi now owns most of the shares of the company after he bought out Wilcock and Blackburn. Today the company has more than 16 million licenses deployed worldwide, across 1,400 organizations in 42 countries. Its customers are drawn from public and private sectors across the world and include AT&T, Dell, HSBC, Arup, and Ford Motor Company.

The company's name is derived from a computer error. When some Microsoft Windows computers crash, a blue screen containing 1E appears. This name was chosen because the founders wished that 1E could prevent this from happening to big companies.