Sidonia Jędrzejewska is a Polish politician and MEP. She was the Undersecretary of State in the Office of the Committee for European Integration in Poland (2008–2009).
Sidonia Hedwig Zäunemann (1711 – 1740), known as die Zäunemännin, was a German poet. Zäunemann was inspired by the example of Christiana Mariana von Ziegler. She became Poet Laureate of Göttingen at the age of twenty-four.
Sidonia von Borcke (1548–1620) was a Pomeranian noblewoman who was tried and executed for witchcraft. 'In posthumous legends, she was depicted as femme fatale and entered English literature as "Sidonia the Sorceress."'