Cornelia Frida Katz, after her wedding in 1937: Cornelia Frida barones Mackay-Katz, (Amsterdam, July 29, 1885 – Aerdenhout, March 30, 1963) was a Dutch lawyer and Christian Historical Union politician. She was the first female member of Parliament to come from a Protestant Christian party (1922). She was also a member of the municipal council of Amsterdam. Katz was a supporter of the introduction of women's suffrage; she joined the women's movement and became order commissioner at the International Congress for Women's Suffrage in 1904 and in 1909 she became a member of the Amsterdam Department of the Women's Suffrage Union.