Johannes Gerardus Hendricus Sickmann
- Born: Omkr 1852, Nieuwer-Amstel, Amstelveen, Noord-Holland
- Marriage (1): Maria Wilhelmina Elisabeth Wilken on 13 May 1879 in Nieuwer-Amstel, Amstelveen, Noord-Holland
- Died: 7 Apr 1922, Abcoude-Baambrugge, Utrecht, Netherlands about age 70
Johannes married Maria Wilhelmina Elisabeth Wilken, daughter of Everhardus Johannes Wilken and Willemijntje Heus, on 13 May 1879 in Nieuwer-Amstel, Amstelveen, Noord-Holland. (Maria Wilhelmina Elisabeth Wilken was born about 1856 in Amsterdam, Noord-Holland and died on 1 Dec 1914 in Abcoude-Baambrugge, Utrecht, Netherlands.)
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