Siegfried Leysen
- Born: 1963
- Location: Lichtaart, Belgium
- Father: Joannes Franciscus Leysen
- Mother: Dimphna Augusta Wouters
- Sister: Joanna Jan Baptist Maria Leysen
- Brother: Ronald Leysen
- Brother: Eddy Leysen
- Sister: Margaretha Leysen
- Sister: Josepha Leysen
- Brother: Franciscus Leysen
- Brother: Eddy Alfons Maria Leysen