| Egas Moniz I of Ribadouro | |
| Lord of Ribadouro | |
| Tenure: | 1022 - c.1040 |
| Predecessor: | Moninho Viegas, o Gasco |
| Successor: | Hermigio Viegas I |
| Full Name: | Egas Moniz de Riba Douro |
| Birth Date: | 977 |
| Death Date: | before 1044 |
| Noble Family: | House of Ribadouro |
| Spouse: | Toda Ermiges da Maia |
| Issue: | Ermígio Viegas I, Senhor de RibadouroMonio Viegas II, tenensUnisco Viegas, Senhora de BaiãoPedro ViegasÉnego Viegas IIGomes Viegas IVivilide Viegas |
| Father: | Moninho Viegas, o Gasco |
| Url: | | module = |type| religion = } |