Whitmer High School is a public high school in Toledo, Ohio, United States, named for John Wallace Whitmer, an educator who helped organize high school classes for the area. It is the only high school in the Washington Local School District in Lucas County, Ohio, serving the northwest section of Toledo up to the Michigan state line.

Whitmer Senior High School opened in 1924 in the Jefferson building. In 1960, the Whitmer building opened. In 1974, the Whitmer Vocational Building, now the Career and Technology Center (CTC), opened.

Previously known as Whitmer High School, the sounds of a bell tolling can be heard in the middle of the night. The bell has been removed from the belfry for many years. A lifetime janitor of the school known as Oscar is said to watch every school play from the balcony in his afterlife. The seat is reserved for him and he becomes angered whenever someone sits in his seat. He also gets upset when he hears people say they don't believe in him.