If you like Wonder by R.J. Palacio then you might like...
Fish in a Tree by Lynda Mullaly Hunt
Ally has been smart enough to fool a lot of smart people. Every time she lands in a new school, she is able to hide her inability to read by creating clever yet disruptive distractions. She is afraid to ask for help; after all, how can you cure dumb? However, her newest teacher Mr. Daniels sees the bright, creative kid underneath the trouble maker. With his help, Ally learns not to be so hard on herself and that dyslexia is nothing to be ashamed of. As her confidence grows, Ally feels free to be herself and the world starts opening up with possibilities. She discovers that there’s a lot more to her—and to everyone—than a label, and that great minds don’t always think alike.
Rain, Reign by Ann M. Martin
Rose Howard has Asperger’s syndrome, and an obsession with homonyms (even her name is a homonym). She gave her dog Rain a name with two homonyms (Reign, Rein), which, according to Rose’s rules of homonyms, is very special. Rain was a lost dog Rose’s father brought home. Rose and Rain are practically inseparable. And they are often home alone, as Rose’s father spends most evenings at a bar, and doesn’t have much patience for his special-needs daughter.
Just as a storm hits town, Rain goes missing. Rose’s father shouldn’t have let Rain out. Now Rose has to find her dog, even if it means leaving her routines and safe places to search. Rose will find Rain, but so will Rain’s original owners.
Out of My Mind by Sharon M. Draper
Melody is not like most people. She cannot walk or talk, but she has a photographic memory; she can remember every detail of everything she has ever experienced. She is smarter than most of the adults who try to diagnose her and smarter than her classmates in her integrated classroom - the very same classmates who dismiss her as mentally challenged because she cannot tell them otherwise. But Melody refuses to be defined by cerebral palsy. And she's determined to let everyone know it - somehow.
Mockingbird by Kathryn Erskine
In Caitlin’s world, everything is black or white. Things are good or bad. Anything in between is confusing. That’s the stuff Caitlin’s older brother, Devon, has always explained. But now Devon’s dead and Dad is no help at all. Caitlin wants to get over it, but as an eleven-year-old girl with Asperger’s, she doesn’t know how. When she reads the definition of closure, she realizes that is what she needs. In her search for it, Caitlin discovers that not everything is black and white—the world is full of colors—messy and beautiful.Kathryn Erskine has written a must-read gem, one of the most moving novels of the year.