John Sankey, 1st Viscount Sankey (26 October 1866 - 6 February 1948) was a prominent British politician, famous for the Persons Case.

Sankey became a Lord Justice of Appeal in 1928 and was raised to the peerage as Baron Sankey in 1929; that year, he was appointed Lord Chancellor under Ramsay MacDonald's first national government. He served as Lord Chancellor until 1935, when Stanley Baldwin re-entered office.