Tello Alfonso of Castile (1337 – October 1370) was the seventh of the ten illegitimate children of Alfonso XI of Castile and Eleanor of Guzman.

He was a prince of Castile and First Lord of Aguilar de Campoo.

[citation needed] In 1353 he married Juana of Lara (daughter of Juan Núñez III de Lara), but she was reportedly murdered in 1359, on orders of King Peter (Pedro the Cruel).

It is reported that Tello kept the news of her death secret in order to maintain possession of her dowry.

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