Mary Catherine McIntire Pacheco (January 22, 1842 — November 5, 1913) was an American novelist and playwright.

[2] Theatrical works by Pacheco include plays Betrayed, Loyal Til Death, Incog, Malisoff, To Nemesis; or, Love and Hate, American Assurance (later revamped as Nothing But Money), Don Roberto,[3] Tom, Dick, and Harry, Loyal Unto Death, The Leading Man,[4][5] The Two Johnnies,[6] and Three Twins (1908, a musical).

[7] In her life as a politician's wife, Pacheco lived in Sacramento and was, for ten months in 1875, the First Lady of California.

)[8] She hosted a literary salon in San Francisco, drawing "all that were worth knowing in California", according to Western writer Bret Harte.

They had two children, Maybella Ramona (later Mrs. William S. Tevis) and Romualdo Jr. Their son died at age 6 in 1871.