Uline is a privately held American company that offers shipping and packing supplies, as well as other industrial supplies and bulk business goods. It was founded in 1980 by Richard and Elizabeth Uihlein. It has more than 9,000 employees and is headquartered in Pleasant Prairie, Wisconsin. It has distribution centers in the United States, Canada, and Mexico.

Liz and Richard Uihlein are megadonors to conservative and Republican causes. The company and its employees have also extensively donated to conservative and Republican-affiliated political action committees; they were among the largest contributors to political campaigns during the 2020 election cycle, contributing over $31 million before June 2020. The company donated $3 million to the city of Kenosha, Wisconsin to help it build housing in 2023.