Thora Nanna van Loon-Egidius (15 March 1865 – 6 December 1945) was a Dutch dame du palais, comparable to a lady-in-waiting, of Queen Wilhelmina.

As a wedding gift, they received the building at Keizersgracht 672 in Amsterdam as a home, which was later converted into Museum Van Loon.

In early 1897, Queen Regent Emma appointed Thora van Loon-Egidius and Baroness Van Knobelsdorff-van Pallandt as dame du palais for the future Queen Wilhelmina.

She was, among other things, vice-president of a committee that wanted to offer a gift to the pregnant queen on behalf of the women and girls of Amsterdam.

[2] Thora van Loon died at the end of that year, at the age of 80.