Eleventh Hour is a double album by English guitarist, composer and improvisor Fred Frith. It comprises five long pieces composed by Frith between 1990 and 2001, and was performed by the Arditti Quartet (strings) with Uwe Dierksen (trombone), William Winant (electric guitars) and Frith (electric guitars), in Germany and the United States in 2003 and 2004. Frith only plays on the second CD of this album.

With the exception of "Stick Figures", the Arditti Quartet, under the direction of Frith, performed on all the pieces, and were recorded at Il Bagno in Steinfurt, Germany in June 2003.

"Lelekovice", for a string quartet, also called "String Quartet #1", was written in 1990 for Iva Bittová, Lelekovice being the name of the village near Brno in the Czech Republic where Bittová lives. It was first performed in July 1991 by the Edison Quartet at the Nieuwe Musiek Festival, in Middelburg, the Netherlands, and was used by the United States choreographer Amanda Miller in her dance piece, My Father's Vertigo in 1991. A recording was made in December 1992 by the Violet Wires String Quartet in London, which was released on Frith's 1994 album, Quartets. The recording on this album was made by the Arditti Quartet in 2003.

"Tense Serenity", for a string trio and trombone, was written in 1997 and was performed here by the Arditti Quartet as a trio (without Graeme Jennings on violin) and Uwe Dierksen on trombone.

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