Brian David Schweitzer (born September 4, 1955) is an American politician from the U.S. state of Montana. Schweitzer is a Democrat and the current governor of Montana, serving since January 2005. Schweitzer currently has one of the highest gubernatorial approval ratings in the nation, with polls regularly showing a rating of around 70 percent. Schweitzer is also the chair of the Democratic Governors Association.

Schweitzer was born in Havre, Montana, the fourth of six children of Adam and Kay Schweitzer. His maternal grandparents were Irish and his paternal grandparents were ethnic Germans from present-day Russia. Following his high school years at The Abbey in Canon City, Colorado, Schweitzer earned his Bachelor of Science degree in international agronomy from Colorado State University in 1978 and a Master of Science in soil science from Montana State University in 1980.

Upon finishing school, Schweitzer worked as an irrigation developer on projects in Africa, Asia, Europe and South America. He spent several years working in Libya and Saudi Arabia and speaks Arabic. He returned to Montana in 1986 to launch a ranching and irrigation business in Whitefish.