Yes, there is a dress code at the Grand Egyptian Museum. Visitors are expected to dress modestly and avoid wearing revealing clothing such as shorts or sleeveless tops. It is also recommended to wear comfortable shoes as there is a lot of walking involved. If you are unsure about what to wear, it's best to consult with your tour operator or guide for specific guidelines on what is appropriate attire for the museum. As of the time of writing, there was a "smart-casual" dress code in place.