Ms. Flynn (formerly Miss Kroupa or Ms. Kroupa) is the school nurse of Lakewood Elementary School. She gave all the students eye exams in "Arthur's Eyes". During the head lice war, she inspected all the students, teachers, and faculty for lice. She provides Buster's asthma medicine in "Buster's Breathless." She also took care of Arthur and Francine when they didn't feel well in "Arthur's Chicken Pox" and "Vomitrocious", respectively.