Instituted in 1993, the I.G.U invites eminent earth/atmospheric scientist to deliver a special lecture on a topic of current scientific interest. Prof. P.R. Pisharoty delivered the inaugural lecture on 21st Dec 1993. The invited scientist is presented with a Medal.
| 1994 | Dr. Raja Ramanna |
| 1995 | Dr. K.Kasturirangan |
| 1996 | Prof. D.Lal |
| 1997 | Prof. Girish S. Agarwal |
| 1998 | Dr. S.K. Srivastav |
| 1999 | Dr. A.F.Spilhaus Jr. |
| 2000 | Dr. D.P.Rao |
| 2001 | Dr. G.B.Pant |
| 2002 | Dr. R.R.Navalgund |
| 2003 | Dr. D.R.Lakshmi |
| 2004 | Dr. D.Narayana Rao |
| 2005 | Sri Madhavan Nair |
| 2006 | Dr. K. Radhakrishnan |
| 2007 | Dr. P.C.Pandey |
| 2008 | Prof. Archana Bhattacharyya |
| 2009 | Dr. B.M.Reddy |
| 2010 | Dr. V.Jayaraman |
| 2011 | Dr Rengaswamy Ramesh |
| 2012 | Prof. A. Jayaraman |
| 2013 | Prof Surjalal Sharma |
| 2014 | Prof. B.N. Goswami |
| 2015 | No Award |
| 2016 | Prof. Harsh K Gupta |
| 2018 | Dr. Madhavan Nair Rajeevan |
| 2020 | Dr. Satish Singh |
| 2021 | Dr.M. Ravichandran |
| 2022 | Prof. Mrinal K Sen |
| 2025 | Dr. Sunil Singh, NIO Goa |