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Wikipedia says "The next predicted perihelion of Halley's Comet is July 28, 2061."
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Technically, comet Halley exists every night, and every day. It's out there whether you can see it or not. It travels far out beyond the large planets in our solar system, then sweeps back in nearing the sun, and repeats every 75.3 Earth years. So *IS* the comet tonight? Sure it is! It's tonight, it's today, it's tomorrow, it's every day! It's out there! Can you SEE it in tonight's sky? No; not with any instrument you have available on Earth at the moment. But maybe in 2061! (Bring a good book and a sandwich if you're going to wait up for it tonight, okay?)
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http://www.eso.org/public/outreach/press-rel/pr-2003/phot-27-03.html
Halley's next passage through the inner solar system occurs in 2061, 52 years from now. See my previous Best Answer to a similar question for more information:
http://www.mahalo.com/answers/science-and-mathematics/does-anybody-know-whens-the-next-haleys-comet
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