Unico Wilhelm Wassenaer Spartiti Musicali
- Nato: 2nd Novembre 1692
- Morto: 6th Novembre 1766
- Luogo di nascita: Delden, Paesi Bassi
Unico Willem was born in Delden (Netherlands), into a family of generals, admirals and personages holding high positions in the government of the Dutch Republic, gaining more and more wealth through marriage and their own influential positions.