Beth Bailey is a fictional character from the BBC espionage television series Spooks, which follows the exploits of Section D, a counter-terrorism division in MI5. She is portrayed by British actress Sophia Myles. Beth Bailey was introduced in Spooks's ninth series as a private contractor in her first episode, and later joins Section D. The character is based on a real-life person Myles met while working on the series. Reaction towards the character was generally positive.

Spooks is a British television spy drama series that originally aired on BBC One from 13 May 2002 to 23 October 2011, consisting of 10 series. The title is a colloquialism for spies, and the series follows the work of a group of MI5 officers based at the service's Thames House headquarters, in a highly secure suite of offices known as The Grid. In the United States, the show is broadcast under the title MI-5. In Canada, the programme originally aired as MI-5, but later aired on BBC Canada as Spooks.