Defence Research and Development Organisation (DRDO) is an agency of the Republic of India.
It was formed in the year 1958.
It's headquarter is located in New Delhi, India.
It is under the administrative control of the Ministry of Defence, Government of India.

As you have asked about the contact details of the Defence Research and Development Organisation (DRDO) office in Delhi, I am giving you information about it, check below for the details

DRDO bhawan
Government Office
Address:
Rajaji Marg, Vijay Chowk Area, Central Secretariat,
New Delhi, Delhi 110004
Phone:011 2300 7002

It works in following technological areas:

Aeronautics
Armaments
Combat Engineering
Electronics
Life Sciences
Materials
MED
Missiles
Naval Systems