Mary, Lady Slingsby, born Aldridge (perhaps died 1693), was an English actress. After a marriage lasting 1670 to 1680 to John Lee, an actor, during which she was on the stage as Mrs. Lee, she was widowed. She then married Sir Charles Slingsby, 2nd Baronet, a nephew of Sir Robert Slingsby, and performed as Lady Slingsby. Theatre historians have pointed out the difficulty in identifying her roles in the period when Elinor Leigh, wife of Anthony Leigh, was performing as Mrs. Leigh, because the homophones "Lee" and "Leigh" were not consistently spelled at the time.[1]