宪法广场（西班牙语：Plaza de la Constitución），通称为索卡洛（Zócalo，意为柱基），是墨西哥城古城中心的主广场。其名称并非来自于任何一部墨西哥宪法，而是得名于1812年西班牙宪法。原本计划在此修建纪念墨西哥独立的纪念柱，但只完成了柱基部分。柱基早已被摧毁，但这个名字保存了下来。墨西哥其他许多城镇，如瓦哈卡和瓜达拉哈拉，主广场都称为「索卡洛」。

自阿兹特克时代起，这里就是墨西哥人聚集的地方，历史上的Mexica仪式、总督宣誓就职、宣布王室文告、阅兵仪式和独立仪式，今日的宗教活动如圣周和耶稣圣体节，接待外国元首，国家庆典和全国性抗议活动，均在此举行。

The Zócalo (Spanish pronunciation: [ˈsokalo]) is the common name of the main square in central Mexico City. Prior to the colonial period, it was the main ceremonial center in the Aztec city of Tenochtitlan. The plaza used to be known simply as the "Main Square" or "Arms Square," and today its formal name is Plaza de la Constitución (Constitution Square). This name does not come from any of the Mexican constitutions that have governed the country but rather from the Cádiz Constitution which was signed in Spain in the year 1812. However, it is almost always called the Zócalo today. Plans were made to erect a column as a monument to Independence, but only the base, or zócalo (meaning "plinth") was built. The plinth was destroyed long ago but the name has lived on. Many other Mexican towns and cities, such as Oaxaca and Guadalajara, have adopted the word zócalo to refer to their main plazas, but not all.