John Ajvide Lindqvist (Swedish pronunciation) born 2 December 1968 in Blackeberg, Sweden) is a Swedish writer, mostly of horror novels and short stories. His debut novel Let the Right One In, a romantic, social realistic vampire horror story published in 2004, enjoyed great success in Sweden and abroad. Handling the Undead (Hanteringen av odöda) was published in 2005 and involved the rising of the dead as zombies, referred to as the "re-living" by Swedish authorities, in the Stockholm area. In 2006, he released his third book Pappersväggar ("Paper walls"), a collection of short stories. In 2007, his story Tindalos was published as a serial in the Swedish newspaper Dagens Nyheter, and as a free audiobook available through the newspaper's website, read by the author himself. His works are published by Ordfront and have been translated into many languages, including English, Bulgarian, German, Italian, Spanish, Chinese, Hindi, Norwegian, Danish, French, Polish, Czech, Dutch and Russian. Besides fiction he has also written the screenplay for Sveriges Television's drama series Kommissionen, a large part of the material to the television series Reuter & Skoog, as well as the screenplay for the film based on Let the Right One in. The production company Tre Vänner bought the film rights to Handling the Undead and were planning a future production. However, heavy interest for an American version lead to the decision to sell the rights to an American company. Ajvide Lindqvist refused and the film went unmade. Tre Vänner's rights for an adaptation will go out in 2012. Ajvide Lindqvist is hoping to be able to sell it to another company then.

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