Ippolit Karlovich Al'tani or Altani (Russian: Ипполит Карлович Альтани; 27 May [OS 15 May] 1846, in South of Ukraine – 17 February 1919, in Moscow) was a Russian Empire conductor, choirmaster and violinist.
In 1866 he graduated from Saint Petersburg conservatory as violinist (studied under Henryk Wieniawski) and composer (studied with Nikolai Zaremba, and Anton Rubinstein). In 1867-82 he worked as a conductor and choirmaster at the Russian opera in Kiev. Al'tani's activity contributed to the development of musical stage skill in Ukraine. In 1882-1906 Al'tani was chief conductor of the Bolshoi Theatre in Moscow.
Al'tani had a significant association with Tchaikovsky. He conducted the first performance of the 1812 Overture (1882) and the first performances at the Bolshoi Theatre of his operas Mazeppa (1884), The Enchantress (1890), The Queen of Spades (1891) and Iolanta (1893).
- [I. K. Al'tani] И. К. Альтани..., «Русская музыкальная газета», 1902, № 41;
- [Ippolit Karlovich Al'tani] Ипполит Карлович Альтани. (По поводу 25-летия его дирижёрской деятельности), в кн.: Ежегодник императорских театров, в. 6—7, [СПБ], 1909.