John F. "Denny" Driscoll (November 19, 1855 – July 11, 1886) was an American Major League Baseball pitcher from 1880 to 1884.

[1] While playing for Pittsburgh, he led the American Association in earned run average in 1882, at 1.21.

Driscoll was playing baseball professionally for local teams in Lowell and Nashua, New Hampshire by the age of 15.

Soon afterwards he moved to Westford, most likely in the village of Graniteville, as the Casey family members were employed in the local granite quarries and mills.

[3] Driscoll died in his hometown of Lowell, Massachusetts at the age of 30 of consumption (tuberculosis).