Darius Grigalionis (born April 21, 1977 in Panevėžys) is a backstroke swimmer from Lithuania, who competed in three consecutive Summer Olympics for his native country, starting in 1996.

He was born in the city of Panevėžys.

A student of the Kaunas University of Technology, he had been a scholarship holder with the Olympic Solidarity Program since August 2002.

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