Olthuis
Olthuis is the family name of the following people:
- Esmée Olthuis (* 1969), Dutch jazz and improvisation musician, composer and music teacher
- Kees Olthuis (1940–2019), Dutch bassoonist, pianist and composer
- Nadja Olthuis (* 1986), Dutch soccer player
- Theo Olthuis (* 1941), Dutch writer and poet