Lithuania competed at the 2018 Summer Youth Olympics, in Buenos Aires, Argentina from 6 October to 18 October 2018.

Lithuania qualified one gymnast based on its performance at the 2018 European Junior Championship.

[1] Lithuania qualified one boat based on its performance at the 2017 World Rowing Junior Championships.

[2] Qualification Legend: FA=Final A (medal); FB=Final B (non-medal); FC=Final C (non-medal); FD=Final D (non-medal); SA/B=Semifinals A/B; SC/D=Semifinals C/D; R=Repechage Lithuania qualified one table tennis player based on its performance at the European Continental Qualifier.

[3]