Willem van der Vegt
- Name: Willem van der Vegt
- Delegation: Netherlands
- Role(s) within the IOI: Deputy Leader (former, former), Delegation Leader (current, current), Guest (former, former), HSC Member (former, former)
- Affiliation: Christelijke Hogeschool Windesheim Zwolle
- Email: firstname.lastname@example.org
Willem van der Vegt is teacher trainer for mathematics and computer science at Windesheim University for Applied Sciences in Zwolle, the Netherlands. He is contest director for the first rounds of the Dutch Olympiad in Informatics and joined IOI since 1992.