John William Jagger (20 September 1859, Yorkshire - 20 June 1930, Cape Town) was a South African businessman and cabinet minister.

[1] In 1883 he established his own business as an importer of fabrics and laid the foundation for the later well-known firm by his name.

[1] From 1908 to 1909 he was a member of the National Convention which drafted the South Africa Act and paved the way for Union.

In 1921 he became Minister of Railways in Gen. Jan Smuts's cabinet,[2] during which he had to carry out the unpopular policy of retrenchments.

He contributed extensively to educational causes, including the Jagger Library at the University of Cape Town, which is named after him.