IES

The initialism IES may refer to:

Government organizations

• Indian Economic Service
• Indian Education Service, in British India
• Institute for Environment and Sustainability of the European Commission
• Institute of Education Sciences of the U.S. Department of Education

Non-profit organizations

• Institute for the International Education of Students
• Illuminating Engineering Society
• International Enterprise Singapore
• International Society of Endocrinology
• Israel Endocrine Society
• Israel Exploration Society
• Institution of Environmental Sciences

Companies

• IES Ltd (Integrated Export Systems), a transportation software company
• Integrated Electrical Services
• Internationella Engelska Skolan

Other

• Indian Engineering Services
• The Indrema Entertainment System, also known as the L600, an unreleased sixth generation video game console
• Integrated Encryption Scheme, in cryptography, a public key cryptosystem
• Intertemporal elasticity of substitution
• Intuitive eating scale