There is the occasional witch, but always shown to be a bad guy right away. Lots of creatures out of classical mythology, because Lewis was a classical fellow, but in Narnia it is classicism tamed and subject to Christ. Only once, IIRC, does a good character attempt a "spell". It is immediately shown to be a Bad Thing, and she repents very sincerely within a page or two.
They are relatively short novels, entertaining and well written. I think it would be worth your time to read them yourself to make sure if you think they're appropriate for your children. It has magic, but it's definitely not a Harry Potter type of DIY "if only you had the secret" type of magic. Lewis always portrays any attempt at the supernatural without going through God as evil and not to be done.