Number Six is a family of fictional characters from the reimagined science fiction television series, Battlestar Galactica. She is portrayed by Canadian actress and model Tricia Helfer. She is the sixth of the twelve known Cylon models, and like the other significant seven, there are several versions of her, including Caprica Six, Baltar's "Head Six", Shelly Godfrey, Gina Inviere and Natalie.

Number Six is a seductive, statuesque Cylon infiltrator. She was the first example shown of a new generation of Cylons capable of adapting to human form and emotions. Little else is known of her earlier years.

She can, like other Cylons, retain memories which can be downloaded into another body if the original body is killed. Like her counterparts, her body was designed to mimic the human body at the cellular level, making her almost undetectable to testing procedures, and there are many copies of her in existence. Most versions of Six have platinum-blonde hair, including Caprica Six, Shelley Godfrey, and Sonja.

Others such as Gina Inviere, Natalie, and Lida have honey-blonde hair, and one Six with black hair has been observed. Since her debut in the mini-series, a leitmotif has been used in scenes featuring Tricia Helfer as Number Six. This simple 9-note motif was composed by Richard Gibbs.

The 9/8 figure is divided unevenly into a group of 3 notes, followed by 3 groups of 2. It is almost always performed on a gamelan, and also plays over the introduction to each episode of the series. On the published series soundtrack, the melody is listed as The Sense of Six.

For her role as Six, Tricia Helfer received a Leo Award for "Best Lead Performance by a Female in a Dramatic Series".

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