Pentti Aalto (July 22, 1917 – November 30, 1998) was a Finnish linguist who was the University of HelsinkiDocent of Comparative Linguistics 1958–1980. Aalto was a student of G. J. Ramstedt. He defended his doctoral dissertation in 1949 in Helsinki.
Aalto published on the Latingerundive, the Latin gerund, the Greekinfinitive, the history of the Finnish study of Oriental, classical, and modern languages. He edited Ramstedt's comparative Altaic grammar and completed an edition of the Mongolian version of the Pan̂carakṣā and a collection of Latin sources of Northeast Asian peoples.