In the male (2nd & 3rd photo) of the Meadow Brown (Maniola jurtina), the top of the forewings is brown with an black "eye spot" in the tip of the forewings.  
The female (1st photo) has an orange field on the forewings, and the black eye spot usually has a white core (1st photo). 
Sometimes there is a double white core in the spot in the wing tip.
Confusion with the Gatekeeper (Pyronia tithonus) is possible, but the Meadow Brown has no orange on the hindwing, or very little, while in the Gatekeeper the hindwing is orange with a wide brown edge.

Monfragüe National Park, Extremadura, Spain, 11 & 12 June 2024