John of Monmouth (disambiguation)
John of Monmouth was an Anglo-Norman feudal lord.
John of Monmouth or John de Monmouth may also refer to:
- John of Monmouth (died 1257), Anglo-Norman feudal lord, son of John of Monmouth
- John of Monmouth (bishop), bishop of Llandaff
- John de Monmouth (MP) for Gloucester (UK Parliament constituency)