Joshua Gwillen Doan (1811 – February 6, 1839) was a farmer and tanner who participated in the Upper Canada Rebellion of 1837. He was born in the Sugar Loaf area of the Niagara District in 1811 to a family of Quakers who had left Pennsylvania before the start of the War of 1812. He began farming and then became a tanner when his brother opened a tannery in 1832. During 1837, he became a supporter of William Lyon Mackenzie. On December 9, 1837, with Charles Duncombe, he organized a group of men to join Mackenzie's revolt in Toronto, not realizing that the revolt had already been put down. On December 13, they were dispersed by loyalist troops led by Colonel Allan MacNab near Brantford.