John Crysler (July 24, 1770 – January 18, 1852) was a businessman and political figure in Upper Canada. He was born in Schoharie, New York in 1770, the son of German immigrants; the family name was originally spelled Krausler or Kruessler. His father served in the King's Royal Regiment of New York during the American Revolution under Sir John Johnson; and John Crysler was a drummer boy with Butler's Rangers. They both settled in Williamsburgh Township after the war. Crysler operated a tavern, cut timber to supply the Royal Navy with masts and built gristmills and sawmills. In 1804, he was elected to the Legislative Assembly of Upper Canada representing Dundas. In 1806, he was appointed justice of the peace in the Eastern District. He served with the Dundas County Militia during the War of