The 1 by 1 Tour (stylized in all lowercase) was the third concert tour by American singer-songwriter Billie Eilish, launched in support of her debut EP Don't Smile at Me.

The tour began on October 20, 2018 in Oakland, California, and concluded on March 9, 2019 in Barcelona, Spain.

The tour was first announced with its North American dates on July 23, 2018,[1][2][3] and the European leg was later announced on July 27, 2018.

[4] This set list is representative of the tour's final concert on March 9, 2019, in Barcelona, Spain.

Eilish performed 8 songs from Don't Smile at Me, 5 standalone singles and 4 songs from When We All Fall Asleep, Where Do We Go?.