Kęstutis Marčiulionis (born April 4, 1977) is a Lithuanian basketball player. He is a 6'2" (1.88 m) point guard. Kęstutis Marčiulionis played NCAA collegiate basketball at the University of Delaware in the United States. He has represented his home country in several international competitions, most notably the 2000 Summer Olympics, where he won a bronze medal. Marčiulionis also played high school basketball for Huguenot Academy, a small private school located in Powhatan County, Virginia, during its 1994–1995 season.