Selys Longchamps is a Belgian baronial noble family.
In 1656, Michel de Selys, former mayor of Liège, received at the same time as his brothers Hubert and Godefroid, a nobiliary title from Ferdinand III, Holy Roman Emperor. [1] His grandson, Walter de Selys, received in 1699 [2] [3] from Leopold I, Holy Roman Emperor the title of Baron of the Holy Roman Empire, transferable to all legitimate male or female descendants. [4]