Johannes Bosscha Jr. (18 November 1831 - 15 April 1911) was a Dutch physicist.

Bosscha came from a family long known for their academic achievements. His great-grandfather and grandfather were classical scholars. His father, Johannes Bosscha Sr. (1797-1874), was a professor of history and literature and also was minister of church-state relationships in two governments (1853-1861).From 1844-1848 Johannes Jr. attended a Latin school in Amsterdam, after which he enrolled at Leiden University.