Martha Cranmer Oliver (1834 – 20 December 1880), also known as Pattie Oliver or M. Oliver, was an English actress and theatre manager.
Beginning as a child actor near her home in Salisbury, Oliver was performing in London by age 13. She played in major theatre companies in the West End, including those of Madame Vestris and J. B. Buckstone. She was the leading comic actress at the Strand Theatre for several seasons in the late 1850s. She also played Mary Meredith in the hit play Our American Cousin at the Haymarket Theatre, among other engagements.
In March 1866, Oliver became manager of the New Royalty Theatre, often taking leading roles. In November 1866, she produced F. C. Burnand's burlesque on Black-eyed Susan. The piece was an enormous hit, playing for nearly 500 nights at the theatre, with Oliver starring in the title role. She was also known for helping members of her profession. She gave up management in 1870, acting in New York for a time with Lydia Thompson's troupe, but soon retired from the stage.