Robert H. "Three-Fingered" Birch, born Robert Henry Birch (c. 1827 – c. 1866), was a 19th-century American adventurer, criminal, soldier, lawman, postmaster, and prospector. He was a member of the infamous "Banditti of the Prairie" in his youth, whose involvement in the torture-murder of Colonel George Davenport in 1845 led to his turning state's evidence against his co-conspirators. Birch was also the discoverer of the Pinos Altos gold mine with Jacob Snively and . During the American Civil War, he served in the American Southwest with the Confederate forces of the Arizona Rangers and .