Thomas Alexander Bailey (born 18 January 1956) is an English singer, songwriter, musician, composer and record producer. Bailey came to prominence in the early 1980s as the lead vocalist for the new wave band Thompson Twins, which released five singles that entered the top ten charts in the United Kingdom during the 1980s: "Love On Your Side", "We Are Detective", "Hold Me Now", "Doctor! Doctor!", and "You Take Me Up". He was the only member of the band to have formal musical training. From 1994, Bailey was also a member of its later incarnation, Babble, releasing two commercially unsuccessful studio albums. He released his debut solo studio album Science Fiction in 2018.

He currently works in various musical fields including scoring for film. He records and performs dub music under the name International Observer and Indo-fusion music with the Holiwater Project. He also collaborated with astronomer and visual artist José Francisco Salgado as part of the audio-visual ensemble Bailey-Salgado Project (BSP).