Boris Konstantinovich Zaytsev (Russian: Бори́с Константи́нович За́йцев; 10 February 1881 – 22 January 1972) was a prose writer and dramatist, and a member of the Moscow literary group Sreda.

In 1922 he was allowed to move to Paris for health reasons, where he became one of the leading emigre writers.

He published many works in exile, including his novel of love set in Russia, Anna (1929).

The key influences on Zaytsev's fiction writing were Mikhail Lermontov, Vasily Zhukovsky, and Alexander Blok.

Art historian Francis Haskell was the son of his sister Vera.