Alexander "Sascha" Schapiro (Russian: Александр Шапиро; c. 1889 – 1942), also known by the noms de guerre Alexander Tanarov, Sascha Piotr, and Sergei, was a Jewish Russian anarchist that fought in both the Russian Civil War and the Spanish Civil War. Born to a wealthy family, Schapiro renounced the privileges of his upbringing and became affiliated with anarchists in his teenage years. After the dawn of the Russian Revolution, Schapiro aligned himself with the Revolutionary Army of Ukraine, and he fought alongside Nestor Makhno and Maria Nikiforova until the defeat of the anarchists at the hands of the Red Army in the Russian Civil War.