Willemstad (English: William Town) can refer to:
- Willemstad, the capital city of Curaçao, Kingdom of the Netherlands
- Willemstad, North Brabant, a town in Moerdijk, the Netherlands
- Willemstad, Groningen , a hamlet near Marum, the Netherlands
- Willemstad, Friesland , a hamlet in the Netherlands
- Willemstad (minesweeper)