Otto Adolf Weismann von Weißenstein

Baron Otto Adolf Weismann von Weißenstein (?-1773, simplified also as Weismann von Weissenstein or Weismann; Russian: Отто-Адольф Вейсман фон-Вейсенштейн, romanized: Otto-Adol'f Veysman fon-Veysenšteyn) was a Russian nobleman and General from Livonia of Baltic-German descent. He was considered one of the Russian Empress Catherine's finest generals alongside Alexander Suvorov and Pyotr Rumyantsev.

Weismann, according to the accounts of his contemporaries, had great military talent and enjoyed the trust and love of troops; his name was the most popular in Rumyantsev's army. Because of his courage, speed of action and coup d'œil, he had much in common with Suvorov; which Rumyantsev acknowledged. Suvorov regarded Weismann as one of the greatest Generals of Catherine's century. In his correspondence, while talking about the death of Weismann during Rumyantsev's campaign, he wrote: "Weismann was gone—I was left alone."