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|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 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.
Weeratunga is accused by the Ukrainian government of arms sales to the separatist rebels fighting government forces in Ukraine.[when?] The Sri Lankan government is currently investigating these allegations and withdrawn his diplomatic passport but his whereabouts are not known to the Sri Lankan authorities.[when?] The Financial Crimes Investigation Division applied for, but did not receive, an Interpol warrant for his arrest on 30 September 2016.
16 banks accounts of Weeratunga was suspended by the courts in January 2017 due fraud. The case is ongoing with out Weeratunga not attending the case. 
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.
- Sooriyagoda, Lakmal (26 September 2016). "INTERPOL warrant on Udayanga?: Court will decide on Sep.30". Associated Newspapers of Ceylon Ltd. Retrieved 5 October 2016.
- "Police trying to withdraw passport to find Udayanga.". Lankanewsweb.net. 12 April 2015. Retrieved 2015-04-12.
- "Court Says 'No' To FCID's Request For Warrant To Arrest Udayanga Weeratunga". Colombo Telegraph. 30 September 2016. Retrieved 5 October 2016.