John Jacob
John Jacob may refer to:
- John Jacob, Marquis of Montferrat
- Sir John Jacob, 1st Baronet, royalist MP in England
- Sir John Jacob, 2nd Baronet of Bromley, his son, of the Jacob baronets
- Sir John Jacob, 3rd Baronet of Bromley, his son, of the Jacob baronets
- John J. Jacob , Kentucky businessman, financier, and philanthropist
- John Jacob , British officer and founder of Jacobabad in Pakistan
- John J. Jacob , Governor of West Virginia in the United States
- John Jacob, member of the Indiana House of Representatives
- John Edward Jacob, president of the National Urban League in the United States
- John C. Jacob, environmental pioneer in Kerala, India
- John P. Jacob, American writer and curator
- E. John Jacob, member of the Kerala Legislative Assembly
- S. John Jacob, member of the Tamil Nadu Legislative Assembly