Alien (stylised as A1IEN) is the fifth studio album by Australian heavy metal band Northlane. It was released on 2 August 2019 through UNFD. It was self-produced by the band themselves and recorded at Chris Blancato's Studio in Sydney, although Marcus Bridge's vocals were recorded at Electric Sun Studios in Arndell Park. The album's second single, "Bloodline", shows the group's continuity of slight departure from their metalcore roots and towards a more alternative and experimental sound, as established on their previous releases, Node and Mesmer. It also marks the group's first shift into different genres, as they blended into the album elements of nu metal, industrial metal and EDM. This is the last album to feature their founding bassist Alex Milovic, who only appeared on the track "Vultures".

At the ARIA Music Awards of 2019, the album won the award for Best Hard Rock or Heavy Metal Album, making Alien their third ARIA-award winning album.

At the J Awards of 2019, the album was nominated for Australian Album of the Year.

At the AIR Awards of 2020, the album won Best Independent Heavy Album or EP.

In 2020, a deluxe edition of Alien was released, which contains a bonus track "Enemy of the Night" and instrumental versions of all songs. A double LP neon pink vinyl was released, limited to unknown amount of physical copies worldwide, and it was later made available digitally for streaming and download.