Mediator may refer to: A person who engages in mediation Business mediator, a mediator in business Vanishing mediator, a philosophical concept Mediator variable, in statistics Chemistry and biology Mediator (coactivator), a multiprotein complex that functions as a transcriptional coactivator Endogenous mediator, proteins that enhance and activate the functions of other proteins Gaseous mediator, chemicals produced by some cells that have biological signalling functions Mediator, a brand name of benfluorex, a withdrawn appetite suppressant medication Internet, software, and computer Mediator pattern, in computer science A mail server's role in email forwarding Other Mediator, guitar pick or plectrum, an accessory for picking strings of musical instruments The Mediator, a teen book series by Meg Cabot (some under the pseudonym Jenny Carroll) The Mediator, a television documentary produced by Open Media Mediator (Christ as Mediator), an office of Jesus Christ Linesman/Mediator, a radar system in the United Kingdom HMS Mediator, three ships of the British navy USS Mediator, a ship of the United States navy Mediator, brand name for benfluorex, an anorectic and hypolipidemic agent