Series 4

Series 4 could refer to:


 * Season 4 of the original Doctor Who series (1966-67)
 * Series 4 of the revived Doctor Who series (2008)
 * Series 4 of Torchwood - reported to be in pre-production as of November 2009.
 * Series 4 of The Sarah Jane Adventures, which according to Doctor Who Magazine is in pre-production as of November 2009.