Maria Winetzkaja (née Kleiner, Russian: Мария Винецкая; born c. 1889[1][2] – May 22, 1956), also seen as Maria Winetskaja, was an American mezzo-soprano opera singer born in Kishinev, in present-day Moldova.

She attended the Imperial Conservatory of Music at Kishinev on a scholarship as a girl, but interrupted her studies in March 1904[2] to move to the United States with her family.

[3][4] Winetzkaja was with the Boston National Grand Opera Company from 1917 to 1918.

She toured South America and the Caribbean with the Bracale Opera Company from 1919 to 1921.

[3] Winetzkaja and civil engineer Schai Winett never officially married, but they lived as a married couple from about 1909, and she used a feminine version of his original surname (Winetsky) as her own.