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This is a disambiguation page.
It points to other pages that have similar names. If you followed a link here, please fix it to point to one of the pages listed below.
Sigma may refer to:
- Ood Sigma, an Ood (DW: Planet of the Ood)
- Sigma (planet), the home of Dr. Ivan Asimoff (DWM: "The Fabulous Idiot")
- Earl Sigma (DW: The Happiness Patrol)
- Theta Sigma, an alias of the Doctor (DW: The Armageddon Factor, The Happiness Patrol, DWMS: Flashback)