Mary Montagu Billings French was an American heiress and society figure, as well as YWCA president and board member. She was the daughter of Frederick Billings and inherited the Marsh-Billings-Rockefeller National Historical Park from him before she died. She passed it on to her daughter, Mary French Rockefeller.

Frederick H. Billings was an American lawyer, financier, and politician. He is known for his legal work on land claims during the early years of California's statehood and his presidency of the Northern Pacific Railway from 1879 to 1881.