Delia Mayer (born 8 March 1967) is a Hong Kong-born Swiss actress and singer. She is known for her roles as Isabel Becker in the German television series Die Cleveren and as Miriam Shapiro in the German-American television drama mini-series Unorthodox.

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Mayer was born on 8 March 1967 in Hong Kong.^[1] She is the daughter of Swiss jazz musician Vali Mayer and sister of Jojo Mayer, and grew up near Zürich.^[1] She trained in acting, dance, and singing in Vienna and classical singing at the Zürich Conservatory and the BGZ Opera School.^[2]

She played Isabel Becker in the German television series Die Cleveren and as Miriam Shapiro in the German-American television miniseries Unorthodox.^[3]