Woldemar Hau (Russian: Владимир Иванович Гау, romanized: Vladimir Ivanovich Gau; 14 February [O.S.

11 March] 1895) was a Baltic German watercolour painter best known for his portraits of Russian Imperial family and nobility, typical of the Biedermeier style.

At age sixteen, he was offered an opportunity to paint the Grand Duchesses and received a letter of recommendation to Alexander Sauerweid, a Professor at the Imperial Academy of Arts.

On his return, he was named Court Painter, spending the next three decades painting the Royal Family and their associates.

He eventually painted all the members of the Royal Family as well as many familiar figures in Russian and Baltic German society, such as Ferdinand Johann Wiedemann and Natalia Pushkina.