Katherine Ayres is an American writer of children's literature and resident of Pittsburgh, Pennsylvania. She is a founding member of the Pittsburgh Public Theater's Playwrights’ Lab. In 2008, she described herself as "a poster child for early literacy."
Ayres was employed as an educator and elementary school principal during the early phase of her professional life. She began writing for children in the 1990s. In 2008, Ayres traveled throughout Pennsylvania, reading her book, Up, Down, and Around, to preschool-aged children participating in the Pennsylvania One Book, Every Young Child literacy program. Roughly ninety thousand copies of her book were distributed to childcare and Head Start centers, family literacy programs and public libraries across Pennsylvania as part of the program, which was estimated to reach as may as five hundred thousand children that year. That same year, her poem, Roadside Shrine, was published in the Pittsburgh Post-Gazette.