Betty Callish (August 24, 1886 – after 1941) was a Dutch-born actress, singer, and violinist who performed in Dutch, English, German, French and Italian.

[1] In 1941, as Roxo Betty Weingartner, she became a postulant of the Third Order Regular CSMV, a cloistered religious community at the Convent of St Thomas the Martyr in Oxford.

She knew Sarah Bernhardt from childhood,[1] and on her advice studied acting, learned to play the violin, and trained as a singer in Berlin.

[10][11] "She is a pretty soubrette," commented American critic Burns Mantle, "who both sings and plays violin – pleasantly but neither with surpassing skill.

"[12] In 1941, after a divorce and a time in treatment for alcoholism, Betty Weingartner became a postulant at the Third Order Regular CSMV, a cloistered religious community at the Convent of St Thomas the Martyr in Oxford.