Tlacopan, also called Tacuba, (Classical Nahuatl: Tlacōpan, [t͡ɬaˈkóːpan̥]) was a Tepanec / Mexica altepetl on the western shore of Lake Texcoco.

[2]: xxxviii Aculnahuacatl Tzaqualcatl, the son of the Tepanec ruler, Tezozomoc, was installed as tlatoani of Tlacopan until his death in c.1430.

In 1521, the Aztec Empire collapsed as a result of the Spanish conquest of Mexico, led by Hernán Cortés and his native Tlaxcallan allies.

The archæological site of Tlacopan is located in Tacuba, within the present-day municipality of Miguel Hidalgo.

Tlacopan was mostly leaderless from 1526 to 1550; the de facto ruler was Isabel Moctezuma since the city was part of her encomienda.