Joseph Underleak (March 13, 1854 – February 21, 1951) was an American lawyer, businessman, and politician.
Underleak was born in Bohemia and emigrated with his parents when he was two months old to the United States and settled in Wisconsin.
In 1856, Underleak moved with his family to Chatfield, Olmsted County, Minnesota and was also involved in the mercantile, lumber, hardware, and banking businesses.
Undreleak lived in Chatfield, Minnesota with his wife and family.
He served on the Olmsted County Commission and on the Chatfield School Board.