Daniel Roy LeMahieu (November 5, 1946 – February 18, 2022) was an American newspaper publisher and Republican politician from Sheboygan County, Wisconsin. He served 12 years in the Wisconsin State Assembly, representing Wisconsin's 59th Assembly district from 2003 to 2015. Before his election to the Assembly, he served 14 years on the Sheboygan County board of supervisors, and was chairman from April 2000 to December 2002. He was the publisher of the Oostburg-based Lakeshore Weekly advertiser for 23 years.
His son, Devin LeMahieu, went on to serve in the Wisconsin Senate and is the current majority leader in the Senate.