The Institution of Engineers of India (IEI) is the national organisation of engineers in India. The IEI was founded in 1920 and incorporated by Royal Charter in 1935.

The Institution of Engineers of India (IEI) was established in 1920 in Madras with Sir Thomas R J Ward as the founding president. It was formally inaugurated in 1921 by Lord Chelmsford, then-Viceroy of British India. In 1935, after a successful petition from Sir Thomas Guthrie Russell (IEI President 1933–1934), the IEI obtained a royal charter of incorporation from King George V to promote and advance the science, practice, and business of engineering.

The branches of this organisation gradually began spreading across the country, leading to the formation of local institutions. Technical operations were established in 1944, with four large departments: civil, mechanical, electrical, and general engineering.

In 1947, four new centres opened: Mdhyprant, Sindh, Baluchistan, and Tiruwankur. Harold Williams served as president for a period in the 1950s. The Institution obtained the full membership of the Engineers Mobility Forum (EMF) at the bi-annual International Engineers Meetings 2009 held in Kyoto, Japan on 17 June 2009. Dr L V Muralikrishna Reddy assumed the office of IEI president at the annual general meeting held on 21 December 2014.

There are five forums of the IEI: the National Design and Research Foundation (NDRF), Water Management Forum (WMF), Safety and Quality Forum (SQF), Sustainable Development Forum (SDF) and Rural Development Forum (RDF). The IEI also has an autonomous organ, the Engineering Staff College of India.

In addition to representing India in the Engineers Mobility Forum, the Institution has been prominent in the World Mining Congress (WMC), the World Federation of Engineering Organizations (WFEO), the Commonwealth Engineers’ Council (CEC), the International Federation for Structural Concrete (fib), and the Federation of Engineering Institutions of South and Central Asia (FEISCA). It has no worldwide bilateral agreements with other professional societies.