"Doctorin' the Tardis" ( sample ) is an electronic novelty pop single by The Timelords ("Time Boy" and "Lord Rock", aliases of Bill Drummond and Jimmy Cauty, better known as The KLF). The song is predominantly a mash-up of the Doctor Who theme music, Gary Glitter's "Rock and Roll (Part Two)" with sections from "Blockbuster!" by Sweet and "Let's Get Together Tonite" by Steve Walsh. The single was not well received by critics but was a commercial success, reaching number 1 in the UK Singles Chart in June 1988, and in New Zealand, and charting in the Top 10 in Australia, Ireland and Norway.

The Timelords followed up their chart-topping record with a "how to have a number one" guide, The Manual (How to Have a Number One the Easy Way).

The release of "Doctorin' the Tardis" followed a self-imposed break from recording of Drummond and Cauty's sampling outfit, The Justified Ancients of Mu Mu (The JAMs). The single continued The JAMs' strategy of plagiarising and juxtaposing popular musical works. However, unlike the cultish limited releases of The JAMs, in which Drummond's Clydeside rapping and social commentary were regular ingredients, "Doctorin' The Tardis" was an excursion into the musical mainstream, with the change of name to "The Timelords" and an overt reliance on several iconic symbols of 1970s and 1980s British popular culture, including Glitter, the Doctor Who theme song, Doctor Who's Daleks and the TARDIS, Sweet's "Blockbuster!" and Harry Enfield's character 'Loadsamoney'. The song features riffs from the 1973 hit "Blockbuster!" by Sweet and from Gary Glitter's 1972 debut hit "Rock and Roll Parts 1 and 2". Its name is a reference to "Doctorin' the House" by Coldcut.

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