Ruby Blue is the debut solo studio album by Irish singer Róisín Murphy. It was released on 13 June 2005 by Echo. After she and Mark Brydon dissolved their electronic music duo Moloko, Murphy began working with producer and musician Matthew Herbert. The songs were first released through three extended plays and were then compiled into a studio album.

Róisín Marie Murphy is an Irish singer, songwriter and record producer. She first became known in the 1990s as one half of the pop duo Moloko alongside English musician Mark Brydon. After the breakup of Moloko, she embarked on a solo career and released her debut solo album Ruby Blue to critical praise in 2005. Her second solo album, Overpowered, was released in 2007.