Rimantas "Rimas" Kaukėnas (born April 11, 1977) is a Lithuanian professional basketball player for Grissin Bon Reggio Emilia of the Lega Basket Serie A. His long career has taken him to a number of countries, finding the most success in Italy. He has also been a member of the senior men's Lithuanian national team. Playing primarily at the shooting guard position, he can also play as a point guard.

Kaukėnas was a longtime member of Montepaschi Siena of the Italian Serie A.

On August 5, 2012, he signed for his homeland team Žalgiris Kaunas.

He joined Grissin Bon Reggio Emilia in December 2013, helping the side reach the finals of the 2014–15 Lega Basket Serie A. In July 2015, his contract was extended for another season. On July 7, 2016, Kaukėnas retired from professional basketball. On January 7, 2017, Kaukėnas came out of retirement and rejoined Grissin Bon Reggio Emilia for the rest of the season.

Kaukėnas played with the senior men's Lithuanian national basketball team at the EuroBasket 2001, the EuroBasket 2007, where he won a bronze medal, and the EuroBasket 2011. He also played at both the 2008 Summer Olympics and the 2012 Summer Olympics.

Kaukėnas established the Rimantas Kaukenas Charity Group, which aims to provide "magical moments" for children with life-threatening medical conditions. He is married with former Swedish-Serbian basketball player Tanja Kostić, with whom he has three daughters. Tanja follows the activities of RK Charity Group, while Rimantas is playing during the season. He is fluent in English, Italian and Russian.

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