The star of the BAFTA-winning Tracy Beaker and former Strictly Come Dancing finalist will appear alongside Bath favourite Jon Monie, who lives in Wiltshire.
Mr Monie has also written UK Productions’ glittering 2021 show which should have gone on stage last year but was postponed because of the Covid-19 pandemic.
Appearing at the Theatre Royal Bath from Thursday, December 16 to Sunday, January 9, the traditional production will ensure that every family member has a ball.
Dani Harmer said: “I am super excited to be back in Bath! It’s one of my favourite theatres and it’s such a gorgeous city.
"I can’t wait to be reunited with the wonderful Jon Monie and playing the Fairy Godmother for the first time.”
She makes a very welcome return to Bath this Christmas after previously starring in the title role in the Theatre Royal’s 2014 pantomime Cinderella.
Mr Monie, from Holt, added: "I'm genuinely thrilled that Cinderella will be going to the ball in Bath this Christmas. We've got a brand-new script packed full of new jokes, new surprises and same old me. I can't wait!"
In the best-loved pantomime of them all, Cinderella is treated as a servant by her wicked (not to mention ugly) stepsisters.
She needs all the magic her Fairy Godmother can conjure, along with help from her best friend, Buttons, if she is to meet her Prince Charming, and find true love before the clock strikes midnight.
Featuring an enchanting story, side-splitting comedy, lavish settings and adorable miniature ponies, Cinderella looks to be the perfect Christmas treat to entertain all ages.
The Theatre Royal Bath is delighted to welcome back MOORE as sponsor, and is grateful for their continued support.
Tickets are on sale at the TRB box office on 01225 448844 and online at www.theatreroyal.org.uk