Viktor Bunyakovsky, Russian mathematician and academic (d. 1889)
Viktor Yakovlevich Bunyakovsky (Russian: Ви́ктор Я́ковлевич Буняко́вский, Ukrainian: Ві́ктор Я́кович Буняко́вський; 16 December [O.S. 4 December] 1804, Bar, Podolia Governorate, Russian Empire – 12 December [O.S. 30 November] 1889, St. Petersburg, Russian Empire) was a Russian mathematician, member and later vice president of the Petersburg Academy of Sciences.

Bunyakovsky was a mathematician, noted for his work in theoretical mechanics and number theory (see: Bunyakovsky conjecture), and is credited with an early discovery of the Cauchy–Schwarz inequality, proving it for the infinite dimensional case in 1859, many years prior to Hermann Schwarz's works on the subject.