|Education||Nalanda College Colombo|
|Known for||former Sri Lankan Ambassador Russian Federation|
|Relatives||Hon Mahinda Rajapaksa
Udayanga Weeratunga is a Sri Lankan businessman who is the former Ambassador Extraordinary and Plenipotentiary of the Democratic Socialist Republic of Sri Lanka to the Russian Federation. Weeratunga is the a first cousin of Mahinda Rajapaksa, who is the former President of Sri Lanka and he presented his Letter of Credence to then-President of Russia Vladimir Putin on 16 November 2006.
Mr Weeratunga is accused by the Ukrainian government of arms sales to the separatist rebels fighting government forces in Ukraine.  The Sri Lankan government is currently investigating these allegations and withdrawn his diplomatic passport but his whereabouts are not known to the Sri Lankan authorities. 
He was educated at Nalanda College Colombo.
- MiG deal crash lands on Defence Ministry
- "Vladimir Putin accepted letters of credentials from foreign states' new ambassadors to Russia.". Presidential Press and Information Office. 16 November 2006. Retrieved 2009-03-05.
- "Ex Lankan envoy faces probe for arms deals with Ukraine rebels". The Hindu. 22 March 2015. Retrieved 2015-03-30.
- "Police trying to withdraw passport to find Udayanga.". Lankanewsweb.net. 12 April 2015. Retrieved 2015-04-12.