| El Capitan | |
| Type: | Rock outcrop |
| Coordinates: | -1.9°N 354.5°W |
El Capitan is a layered rock outcrop found within the Margaritifer Sinus quadrangle (MC-19) region of the planet Mars, this geological outcrop was first discovered and observed by the Mars Exploration Rover Opportunity in February 2004. The rock outcrop was named for El Capitan, a topographical mountain lying within the state of Texas.