"Radioactive" is a song by Welsh recording artist Marina and the Diamonds from the deluxe version of her second studio album Electra Heart (2012). It was released on 23 September 2011 as the first promotional single from the record; it preceded the premiere of the official lead single "Primadonna" on 20 March 2012.

Diamandis said of "Radioactive":

I wrote "Radioactive" in New York in the middle of a heat wave. Introduced to a glittering new nightlife, I fell in love with New York; it has this magic, fizzing white energy that no other city in the world has. I felt happy and was inspired to write a song that felt light and euphoric, a more streamlined, minimalistic style of songwriting. I have changed my approach to songwriting completely, and as a result, written songs I would never have written on my own (i.e on my shit Argos keyboard alone in my bedroom in London).

Musically, "Radioactive" is a Eurodance song with a minimalist club beat.

"Radioactive" received mostly positive reviews from music critics. Digital Spy editor Robert Copsey gave the song four out of five stars and, regarding the song's "radio-friendly, synth-laden, and deeply hypnotic" chorus, wrote, "[B]efore we accuse her of bandwagon-hopping (it was produced by Rihanna and Katy Perry collaborators Stargate), we're certain it's all part of the irony, right?"Popjustice named it Song of the Day and commented, "What we like most about 'Radioactive' (and we like a LOT about 'Radioactive') is that it sounds quite a bit like loads of stuff that's in the charts, but proves that you don't have to act like a total fucking idiot singing shit about nothing in order to carry it off." Jim Hiscox of the Daily Star also gave the song a positive review, stating, "More straight-up dancefloor action than the Welsh wonder's previous quirks, Marina suddenly sounds a fully-fledged pop star."

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