|Prime Minister of Sri Lanka|
19 November 2005 – 21 April 2010
|Preceded by||Mahinda Rajapaksa|
|Succeeded by||D. M. Jayaratne|
10 August 2000 – 9 December 2001
|Preceded by||Sirimavo Bandaranaike|
|Succeeded by||Ranil Wickremasinghe|
|Born||5 May 1933|
|Died||27 December 2016(aged 83)|
|Political party||Freedom Party|
Ratnasiri Wickremanayake (Sinhala: රත්නසිරි වික්රමනායක, Tamil: ரத்னசிறி விக்க்றேமனயகே; 5 May 1933 – 27 December 2016) was a Sri Lankan politician. He was Prime Minister of Sri Lanka two times from 2000 to 2001 and again from 2005 to 2010. He is currently a National List member of the Parliament of Sri Lanka.
Wickremanayake first served as Prime Minister from August 2000 to December 2001. He became minister after Sirimavo Bandaranaike resigned from the position at the age of 84. He is a senior vice-president of the ruling Sri Lanka Freedom Party (SLFP).