The home of the World War Two Codebreakers invites you to step back in time and experience Christmas in the 1940s, with period decorations in the Mansion and around the park.
Father Christmas will be at Bletchley Park from December 17 until December 23.
As well as the chance to see Father Christmas, each child will receive a present to remember the special day.
There are fun arts, crafts and codebreaking activities to take part in while you wait and vintage festive cartoons.
A Festive Afternoon Tea is also available to book during this time and for those extra chilly days there is mulled wine and mince pies.
The Christmas Grotto visit is £6 per child and tickets can be bought on the day, subject to availability.
Bletchley Park is also open to visitors from December 27 to 31, with a family trail to complete around the park.
For more information visit: www.bletchleypark.org.uk