| ICEMAN | seller or deliverer of ice |
| IDLEMAN | gentleman of leisure |
| INFIRMARIAN | in charge of an infirmary |
| INTELLIGENCER | spy |
| INTENDENT | director of a public or government business |
| INTERFACTOR | murderer |
| IRON FOUNDER | one who founds or iron |
| IRON MASTER | owner or manager of a foundry |
| IRON MONGER | dealer in hardware made of iron (also known as a feroner) |
| IVORY WORKERS | included makers of combs, boxes, billiard balls, buttons, and keys for pianofortes |
