The Nuclear Engineering Institute (IEN) is a unit of the National Nuclear Energy Commission (CNEN), an organ of the Brazilian Ministry of Science and Technology.

Since its foundation, in 1962, IEN has been contributing to the national mastering of technologies in the nuclear field and its correlates. Its scope is generating and transferring knowledge and technology to the productive sector - public and private - with society as its final beneficiary.

Patents publications, technology licensing, radiopharmaceuticals, materials essays and analysis, radioactive waste collecting, consulting and human resources formation are IEN's main products and services.