Tezozomoc Yacateteltetl (also Tezozómoc, Tezozomoctli, Tezozomoctzin; c. 1320 – 1426), was a Tepanec leader who ruled the altepetl (ethnic state) of Azcapotzalco from the year 1353[1] or Five Reed (1367)[2] or Eight Rabbit (1370)[3] until his death in the year Twelve Rabbit (1426).

[4] Histories written down in the early colonial period portray Tezozomoc as a military and political genius who oversaw an expansion of Tepanec influence, bringing about Azcapotzalco's dominance in the Valley of Mexico and beyond.

He is described by Fernando de Alva Cortés Ixtlilxochitl as a tyrant and: "the most cruel man who ever lived, proud, warlike and domineering.

And he was so old, according to what appears in the histories, and to what elderly princes have told me, that they carried him about like a child swathed in feathers and soft skins; they always took him out into the sun to warm him up, and at night he slept between two great braziers, and he never withdrew from their glow because he lacked natural heat.

"[citation needed] He approved the choice of King Huitzilihuitl in 1403 and gave him his daughter Ayauhcihuatl in marriage, notwithstanding the opposition of his son Maxtla.