John Hartwell Hillman Sr. (1840–) was an American businessman, the founder of the Hillman Coal and Coke Company.
He was born in Kentucky in 1840, the eldest son of Daniel C. Hillman (1807–1885) and his first wife Ann Jones Marable.
He started his career in Nashville, Tennessee, before moving to Pittsburgh in the mid-1880s, where he "became one of the financial and industrial leaders".
He established the Hillman Coal and Coke Company, and J. H. Hillman & Sons which was eventually run by his three sons. Eventually, Hillman Coal and Coke Company became Pittsburgh Coke & Chemical, and is now Calgon Carbon.
He married Sallie Murfree Frazer, and they had three sons.