Harry Potter influences and analogues
Many critics have noted that Jill Murphy's "The Worst Witch" series (first published in 1974 by Allison & Busby), is set in a school for girls, "Miss Cackle's Academy for Witches", reminiscent of Hogwarts. The story concerns an awkward pupil at a boarding-school for witches, who faces a scheming rival student. Her professors include a kindly and elderly headmistress and a bullying, raven-haired potions teacher. Murphy has commented on her frustration at constant comparisons between her work and "Harry Potter": "It's irritating … everyone asks the same question and I even get children writing to ask me whether I mind about the Hogwarts school of witchcraft and pointing out similarities. Even worse are reviewers who come across my books, or see the TV series, and, without taking the trouble to find out that it's now over quarter of a century since I wrote my first book, make pointed remarks about 'clever timing' – or say things like 'the Worst Witch stories are not a million miles from J K Rowling's books'. The implications are really quite insulting!"
Witch World
Witch World is a speculative fiction project of American writer Andre Norton, inaugurated by her 1963 novel "Witch World" and continuing more than four decades. Beginning in the mid-1980s, when she was about 75 years old, Norton recruited other writers to the project, and some books were published only after her death in 2005. The Witch World setting is one planet in a parallel universe where magic long ago superseded science; early in the fictional history it is performed exclusively by women. The series began as a hybrid of science fiction and sword and sorcery but for the most part it combines the latter with high fantasy. 
Witch World begins with what is now called the Estcarp cycle. These describe the adventures of Simon Tregarth from Earth, his witch wife Jaelithe, and their three children Kyllan, Kemoc and Kaththea.