I'm not that well-read, but I'll give you the authors that have caught my attention already:
1. J.K Rowling - because genius
2. Jandy Nelson - because "I'll Give You The Sun" is literally everything
3. Harper Lee - no explanation needed
4. Veronica Roth - a young supertalented author who wrote my favorite YA-serie
5. Sara Bergmark Elfgren - a Swedish author who has written "The Circle"-triology together with Mats Strandberg. Very charismatic and clever.
6. Tahereh Mafi - the Shatter Me series is beautifully written
7. Joyce Carol Oates
8. Suzanne Collins
9. Becca Fitzpatrick
10. Astrid Lindgren - even if I'm no longer reading her books I will always bear her stories with me