Untitled #23 is the 23rd album by the Australian alternative rock band The Church, released in March 2009.

The "Operetta" EP followed on 27 November and included the title track plus three jams/outtakes from the Untitled #23 recording sessions: "Silhouette in Meltdown", "Moon Hangs in Black" and "Particles Matter".

At each show, a full color retrospective program was distributed to each audience member, along with the third EP from Untitled #23, "Deadman's Hand", which contained the title track plus four outtakes: "Stardust", "The Kicker", "Dakota" and "The Garden".

In 2011 the album, along with Priest=Aura and Starfish, was played in its entirety on the band's 30th Anniversary "Future, Past, Perfect" tour.

The limited edition double vinyl LP was released through Second Motion and the band's own Unorthodox Records.