The school seal, shown below, illustrates the heritage at the foundation of Mercy McAuley. It emphasizes academic excellence by prominently featuring a book at the center of the seal. A cross above represents the tie to the Sisters of Mercy and a heart below represents the Mercy charism. Flanking the book are wavy lines, which reference the Ohio River and the flag of Cincinnati. The seal further emphasizes the Irish roots of the Sisters of Mercy and Catherine McAuley by using a stylized Celtic knot pattern as the border.