Raïssa Oumansoff Maritain (12 September 1883 in Rostov-on-Don – 4 November 1960 in Paris) was a Russian-born French poet and philosopher.
She emigrated to France and studied at the Sorbonne, where she met the young Jacques Maritain, also a philosopher, whom she married in 1904. She was raised Jewish but, following a period in which she considered herself an atheist, converted to Roman Catholicism with her husband in 1906.