Donaldas Kairys (born 6 March 1977) is a Lithuanian professional basketball coach and former player.
On 4 February 2020, Kairys was signed by Avtodor Saratov as head coach. He left the position after the season ended.
On 9 June 2020, Kairys was named head coach of Rytas Vilnius. On 16 January 2021, Kairys was fired after two decisive losses
Kairys served as assistant coach for the Lithuania national basketball team from 2006 to 2012.