Manju Dinesh Kumara Wanniarachchi (Sinhala: මංජු දිනේෂ් කුමාර වන්නිආරච්චි) (born 2 December 1979) is a Sri Lankan amateur boxer.
On 24 October 2010 National Olympic Committee of Sri Lanka announced that Wanniarachchi had passed a drug test taken during the Commonwealth Games.
[2] A urine sample provided by the boxer had contained viagra, a banned performance-enhancing drug.
The Amateur Boxing Association of Sri Lanka said the "B" sample of 30-year-old Wanniarachchi's urine tested positive for nandrolone, a performance-enhancing substance.
[5] Wanniarachchi was suspended from all boxing meets by the National Anti Doping Organization of Sri Lanka in March 2011.