The scientist who studies mosquitoes is called an entomologist, specifically an medical entomologist.

Here's why:

* Entomologist: This is the general term for a scientist who studies insects.

* Medical Entomologist: This is a specialist within entomology who focuses on insects that impact human health, such as mosquitoes which can spread diseases like malaria, dengue fever, and Zika virus.

So, while all entomologists study insects, a medical entomologist specifically focuses on mosquitoes and their role in human health.