Sophie Thalbitzer (née Zinn, 15 April 1774 – 27 December 1851) was a Danish memoirist known for Grandma's Confessions (Danish: Grandmamas Bekiendelser), which offers a rear first-hand account of everyday life for a child and young woman in an upper-class bourgeois family in Copenhagen during the late 18th and early 19th century.
She was a daughter of the wealthy merchant Johann Ludvig Zinn and grew up in the Zinn House at Kvæsthusgade 3.
The building was listed on the Danish registry of protected buildings and places in 1959.