Alexander Leonidovich von Fessing (Russian: Александр Леонидович фон Фессинг, 17 January 1877 - 12 November 1941) was a Yelisavetgrad-born Russian and Ukrainian, Soviet actor and theatre director, better known under his stage name Zagarov (Загаров).

[1] His best-known roles here included Kleshch (The Lower Depths), Sorin (The Seagull), Publius and Pindarus (Julius Caesar).

From 1921 to 1927 while in exile, he directed at the Ukrainian Discourse Theatre and Uzhgorod Theater "Prosvita".

He taught at the Lviv Drama School, and published letters to defend the Ukrainian language in Western Ukraine.

"The master of high culture, tireless experimenter and a proponent of the Stanislavski and Nemirovich-Danchenko's ideas," was how the Theatre Encyclopedia described him.