Lina Kačiušytė (born 1 January 1963 in Vilnius, Lithuanian SSR) is a Lithuanian swimmer who competed for the Soviet Union, winner of a gold medal in 200 m breaststroke with the Olympic record time of 2:29:54 at the 1980 Summer Olympics.

She surprised everyone by winning the 200 m breaststroke and setting two world records: one in the prelims, defeating world record holder and teammate Yuliya Bogdanova, the second when winning the gold medal in the finals.

She set the world record a third time the following year at the USSR vs. DDR Dual Meet in Potsdam, a record that stood from 1979 through 1985 when it was finally broken by East Germany's Silke Hörner.

Kačiušytė was the first female breaststroke swimmer to go under the 2 minute 30 second barrier for the 200 meter event.

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