James Edward King Jr. (September 15, 1874 – March 9, 1947), born Oscar Folsom Cleveland, was the biological son of Maria Halpin and Grover Cleveland, the 22nd and 24th president of the United States.

Cleveland made payments to Maria Halpin after the boy was born.

[4][3][5] Dr. King (the younger) had a long career as a highly regarded obstetrician/gynecologist and medical school instructor; for many years he supervised Buffalo Women's Hospital (founded in 1885 as Buffalo Maternity Hospital).

[6][7] Dr. King was married to Rose A. Kleinschmidt Weber in 1910,[8] but they were separated or divorced sometime before 1917,[9] and had no children together.

[6][4] King enjoyed travel and frequently provided pro bono medical care to indigent women in the community.