Gerda Johanne Helland Grepp (26 May 1907 – 29 August 1940) was a Norwegian translator, journalist, and socialist. She was the daughter of former chairman of the Norwegian Labour Party Kyrre Grepp and journalist Rachel Grepp.
She was married to Italian-Swiss potter Mario Mascarin (1901–66). They had a son Olav Kyrre (Ping) Grepp and a daughter, Solveig Marie Alexandra "Sacha" Grepp. The daughter was named after family friend Alexandra Kollontai.
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