Star One (also referred to as Arjen Anthony Lucassen's Star One) is a Dutch progressive metal supergroup/side-project of Arjen Anthony Lucassen of Ayreon fame.

The band has released three albums to date: their first in 2002, their second in 2010, and most recently a third in 2022, plus a live album in 2003, and features four different singers: Russell Allen (Symphony X), Damian Wilson (Threshold, Headspace, Arena), Dan Swanö (Edge of Sanity, Nightingale), and Floor Jansen (After Forever, ReVamp, Nightwish).

Unlike Ayreon, the Star One albums do not follow one storyline; instead, each song is a different story with a sci-fi concept, most of the tracks based on existing movies and series. The band takes its name from the second season finale of Blake's 7. The band includes four singers alternating in all the songs, not including Lucassen, who sings occasionally, plays all guitars and keyboards and writes and composes all the songs. The third studio album deviates from this, having a different guest singer on each track.

Star One was born out of the remnants of an abandoned collaboration between Lucassen and Iron Maiden frontman Bruce Dickinson. Dickinson proposed the idea and the two exchanged ideas and put together four songs, Lucassen writing the music and Dickinson writing the lyrics. The project was abandoned however after Lucassen mentioned the project on the internet and Dickinson's manager called off negotiations. Instead of completely abandoning the material that had already been produced, Lucassen decided to put his own lyrics to the music and created Star One.

When asked on the "Ask Arjen Anything" channel of communication if there would be another Star One album, Lucassen simply stated "Probably". However, he later declared:

"Space Metal was really magic. I am afraid that I will fail to capture the same atmosphere and actually ruin it! I am actually against sequels; you cannot repeat the same atmosphere and feeling like you had with the first album."

In an interview conducted by Ragnarok Radio in October 2009 Arjen stated Star One is "definitely not dead."

In October 2009 in another interview, with Lebmetal.com, Arjen said he was working on what might become another Star One album: "In the meantime I will be working on a new, heavier album. Possible a new Star One album, but then again things never work out the way I plan them", and in a November 2009 interview with Lagrossradio.com, Arjen stated that he was definitely working on a new Star One album and that he had already written and recorded a song.