What to get a teenage girl? Well, first of all you want to ask them what they want. They're at an age when details matter a LOT.
If they have a clear birthday wish, just follow their suggestion. They'll thank you for it, though perhaps not in any way you will notice. They are teenagers after all...
Seriously: a teen wants what they want - finding out what they want is a big deal at this age. They're finding they're independence.
Then again, there are gifts that can hardly go wrong. Here are a few likely suggestions, if simply following their hobbies and music preferences doesn't work.

















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Comments
I hear there are twilight girls and Harry Potter girls... The latter being, so the story goes, more independent: not expecting a guy to solve everything for them. Either way: with teens it's very clear, what you know about them is the best guide. I'm sure there are girls who'd love a chemistry set, for instance... But most teen girls would not.
These are all great suggestions! I have two teenagers in my life and they would enjoy any of these (especially twilight!) except harry potter - they haven't really gotten into, but maybe that's catered more towards boys ;) Nice post!!
Those dry erase wall decals look like super gifts for any teen girl! How cool!
Great collection of gift ideas for teen girls. I think my teen girl would like the dry erase best :)