Alfredo Trombetti (16 January 1866 in Bologna – 5 July 1929 in Venice) was an Italian linguist active in the early 20th century.

Trombetti was a professor at the University of Bologna.

He is best known as an advocate of the doctrine of monogenesis, according to which all of the world's languages go back to a single common ancestral language.

His arguments for monogenesis were first presented in his book L'unità d'origine del linguaggio, published in 1905.

A selection of Trombetti's proposed global etymologies:[1]