Lourdes Aflague "Lou" Leon Guerrero is an American politician and former nurse who has served as the 9th governor of Guam since 2019. A member of the Democratic Party, Guerrero is the first woman to serve in the position. Leon Guerrero had served in the Guam Legislature from 1995 to 1999 and again from 2001 to 2007. From 2007 to 2017, Leon Guerrero was president and CEO of the Bank of Guam.

The Democratic Party of Guam is a political party in Guam affiliated with the U.S. Democratic Party. Its origins lie in the Popular Party, which was the only political party on Guam until 1956.