Singular: Act I is the third studio album by American singer Sabrina Carpenter, first released on November 9, 2018, through Hollywood Records.

The album is the follow-up to her 2016 studio album, Evolution. It is considered the first half of a two-piece project, later being supplemented by her fourth studio album Singular: Act II (2019). Carpenter began writing the album in 2016, shortly after the launch of Evolution but she only began to record the songs in 2017.