The O₂ ABC is a nightclub and music venue on Sauchiehall Street, in the centre of Glasgow, Scotland's largest city. The building was constructed in 1875, renovated many times in its lifetime and also largely rebuilt in the 1920s. The building has been used for numerous functions before being finally converted to its current purpose between 2002 and 2005. In 2009, the Academy Music Group took a majority stake in the venue, rebranding it the O₂ ABC. The venue is protected as a category C(S) listed building.