Castellar de Santiago is a Spanish municipality in the province of Ciudad Real, Castilla–La Mancha.

The village lies on the northern slope of the Sierra Morena mountain range.

[2] Castellar de Santiago celebrates several festivals through the year, mostly in the spring and summer months.

It commemorates the Holy Christ of Mercy, which is the patron saint of Castellar.

The closing ceremony on the night of the 16th features a fireworks display.