31st May
- India and Thailand signed a treaty for the extradition of runaways wanted for terrorism, transnational crimes, economic offenses and other serious crimes.
- TVS Logistics Services Ltd. acquired second company in US called Wainwright Industries, the end-to-end supply chain provider.
- As per CSO DATA released on 31 May 2013, economic growth fell to a decade's low of 5 per cent for the entire 2012-13 fiscal
- UNESCO in the Month of May 2013 had declared India's Nicobar Islands as a world biosphere reserve under its Man and the Biosphere Programme.
- According to World Health Organisation, World No-Tobacco day is observed every year on 31 May 2013.
- On 31 May Arvind Mahankali, a 13-year old Indian-American won the Scripps National Spelling Bee contest, as children from the community scripted history by dominating the prestigious competition for the sixth year in a row, grabbing top three slots this year
