Alexandros (アレキサンドロス, Arekisandorosu), stylized as [Alexandros] is a Japanese rock band, signed to RX-Records and managed by UK Project. On March 28, 2014, the band renamed from [Champagne] to [Alexandros] from on request from Bureau du Champagne, Japan.

On November 28, 2014, it was announced that the band would be signed to Universal Music Japan, starting from their single "Wataridori / Dracula la" (ワタリドリ, Dracula la) that was released in 2015. Subsequent album and singles since 2015 have been released by Universal Music Japan.

In 2016, the band performed at the SXSW Music Festival as part of the Japan Nite showcase.

In 2018, their song "Mosquito Bite" was used as the theme for the live-action film adaptation of Bleach. That same year, the band also contributed the theme song ("Arpeggio") and ending theme ("Your Song") to the Sega video game Judgment. A year later in 2019, their song "PRAY" was used as the theme for the Japanese dub of the MonsterVerse film Godzilla: King of the Monsters.

From 2020 to 2021, the band's lead vocalist Yoohei Kawakami was a guest vocalist of two songs by Tokyo Ska Paradise Orchestra for the Japanese Tokusatsu drama Kamen Rider Saber.