John St Aubyn may refer to:
- John St Aubyn (Parliamentarian) (1613-1684) of Clowance
- Sir John St Aubyn, 1st Baronet (1645-1687)
- Sir John St Aubyn, 2nd Baronet (1670-1714)
- Sir John St Aubyn, 3rd Baronet (c. 1702-1744)
- Sir John St Aubyn, 4th Baronet (1726-1772)
- Sir John St Aubyn, 5th Baronet (1758-1839)
see also St Aubyn Baronets