Alexander Alexandrovich Yakhontov (Александр Александрович Яхонтов; 20 December [O.S. 8 December] 1879 in Moscow, Russian Empire — 17 November 1973 in Moscow, U.S.S.R.) was a Russian entomologist who specialized in Lepidoptera. Jachontov described many new taxa mostly at the subspecies level and wrote biogeographic works notably on the Rhopalocera of the Vladimir and Nizhny Novgorod regions and those of the Caucasus.He wrote Nashi dnevnye babochki (Our Butterflies) published in Moscow in 1935. His work appears in The species Sheljuzhko was named for him.