Jurists
- John Parker (Irish judge) (c. 1500–1564), English-born merchant, politician and judge
- John Parker (jurist) (fl. 1655), senior member of the judiciary during the interregnum, father of the Bishop of Oxford Samuel Parker
- John Victor Parker (born 1928), United States federal judge
- John J. Parker (1885–1958), American judge who served at the Nuremberg Trials and missed a nomination to the Supreme Court by one vote
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