| Sancho III | |
|---|---|
 The burial stone of Sancho III, bearing his effigy | |
| King of Pamplona King of the Kingdom of Najera | |
| Reign | 1004–1035 |
| Predecessor | García Sánchez II |
| Successor | García Sánchez III |
| Count of Aragon | |
| Reign | 1004–1035 |
| Predecessor | García Sánchez II |
| Successor | Ramiro I |
| Born | c. 992-996 |
| Died | c. 1035 |
| Burial | |
| Spouse | Muniadona of Castile |
| Issue |
|
| House | House of Jiménez |
| Father | García Sánchez II of Pamplona |
| Mother | Jimena Fernández |
Sancho Garcés III (c. 992–996 – 18 October 1035), also known as Sancho the Great (Spanish: Sancho el Mayor, Basque: Antso Gartzez Nagusia), was the King of Pamplona from 1004 until his death in 1035. He also ruled the County of Aragon and by marriage the counties of Castile, Álava and Monzón. He later added the counties of Sobrarbe (1015), Ribagorza (1018) and Cea (1030), and would intervene in the Kingdom of León, taking its eponymous capital city in 1034.
He was the eldest son of García Sánchez II and his wife Jimena Fernández.