Trent Affair John Pliny Crysler (February 26, 1801 – April 7, 1881) was a timber merchant and political figure in Canada West.

He was a captain in the 1st Battalion, Dundas Militia and led his company into action at the Battle of the Windmill of Nov 12–16 1838.

In 1869, he was appointed Major in the Dundas Reserve Militia, and served until shortly before his death.

Crysler owned the west half of Lot 18 in Winchester Township, land that would become the village of Chesterville.

His home, Crysler Hall, is now preserved as part of Upper Canada Village.