Tanja Kostić (Serbian: Тања Костић, romanized: Tanja Kostić; born November 10, 1972) is a Swedish retired women's basketball player best known for playing with the Oregon State Beavers from 1993 to 1996.

Kostic was born in Solna, Sweden, and was a member of the Swedish national team by age 19.

Kostić made 869 field goals, and set Oregon State and Pac-10 records for free throws attempted (903), free throws made (608), and set an OSU record for field goals attempted with 1,773.

[4][5] Kostić played for the Portland Power of the American Basketball League,[6] as well as the Cleveland Rockers and Miami Sol of the Women's National Basketball Association.

[9] She is married to Lithuanian basketball star Rimantas Kaukėnas, with whom she has three daughters.