Willoughby, Ralph de I Baron Willoughby of Grimsthorpe
| Birth Name | Willoughby, Ralph de I Baron Willoughby of Grimsthorpe |
| Gender | male |
| Age at Death | about 35 years |
| Birth date | about 1115 (Grimsthorpe Castle, Willoughby, Lincolnshire, England) |
| Death date | about 1150 (England) |