Do witches believe in ouija boards?

Short answer: no, not as a core belief — the ouija board isn't a witches' tool at all. It's a late-19th-century parlor toy, invented by a couple of Kentucky brothers, and the name is just "yes" in French and German. Modern Pagan/Wiccan practice doesn't include it in ritual at all; Wicca's own tools are things like athame, candles, herbs, and the Wheel of the Year.

Where the "don't touch that" idea comes from is different:

• Ouija as a doorway. Many witches and occultists treat it not as a divinatory instrument but as an invitation — the "opening" trope, where you make contact with something that then may or may not leave. The rule of thumb is you close the session deliberately, and some traditions say don't do it alone or without knowing how to close.
• Conjure and folk traditions differ. Hoodoo, Santería, and other African-diasporic and Southern folk practices *do* have spirit boards and talking boards in the actual craft, used with instructions and ritual. That's the "witchcraft" most people mean when they say the word, and it isn't the same thing as the parlor board.
• The real objection is usually epistemic, not supernatural. A lot of Wiccans simply say the board is a cold-reading tool: it produces whichever message the group is looking for, which is a psychology fact, not a spirit fact.

If someone told you "a witch said never use a ouija board," the useful question is which tradition they're speaking from — the answer changes a lot between the Wiccan "don't open that door" version and the hoodoo "here's how to use it properly" version.

If you wanted to see where a card deck says the same thing from the other direction, I can pull a three-card spread on the question — just say so.