John F. "Cinders" O'Brien AKA: Darby O'Brien (April 15, 1867 – March 11, 1892) was an American Major League Baseball pitcher from 1888 to 1891.

[1] O'Brien died in his hometown of Troy, New York at the age of 24 of pneumonia.

[2] He is interred at St. Patrick Cemetery in Watervliet, New York.

[1] At the time of his death, O'Brien was under contract with the St. Louis Browns.

This biographical article relating to an American baseball pitcher born in the 1860s is a stub.