Library Journal has an article titled 35 Going on 13: The Year’s Best Teen Fiction for Adults. Two of my favorites of the year are there: The Hunger Games by Suzanne Collins and The Graveyard Book by Neil Gaiman.
I would add a few more:
A Curse Dark as Gold by Elizabeth C. Bunce
The Knife of Never Letting Go by Patrick Ness
The Red Necklace by Sally Gardner
Season of Ice by Diane Les Becquets
Trouble by Gary D. Schmidt
Any other teen novels you would recommend to adults?
Waking Brain Cells 
Living Dead Girl
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Definitely! Goodness does that book stick with you! It’s one of the most powerful books I have read in years. Terrifying and haunting all in one.
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M.T. Anderson’s two Octavian Nothing books, as well as his earlier novel, Feed.
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Ah, now that I click through I see that 1) we’re just talking about this year and 2) that she already nominated Octavian Nothing. Nice to be in good company, at least.
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Here are a couple more…
The adoration of Jenna Fox by Mary E Pearson
Unwind by Neal Shusterman
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