Meg and Mog is a series of children's books written by Helen Nicoll and illustrated by Jan Pieńkowski. First published in the 1970s, the books are about Meg, a witch whose spells always seem to go wrong, her striped cat Mog, and their friend Owl. The first book was published in January 1972. Following the death of Helen Nicholl in 2012, the series has been continued by Pieńkowski and David Walser. A successful stage play also ran in London in the 1980s starring Maureen Lipman as Meg.