The Don Mariano Marcos Memorial State University, more often referred to by the acronym "DMMMSU" (pronounced DEEM-su) is the state university serving the province of La Union in the Philippines. Its main campus is in Bacnotan, La Union. It was created by former president Ferdinand Marcos by using Presidential Decree 1778 to combine a number of state-run schools in La Union into a single state college in 1981. Like Mariano Marcos State University in Ilocos Norte, it is named for the former president's father, Mariano Marcos.
Before 1993, DMMMSU occupied seven campuses throughout the province. After a reorganization that year, these campuses were grouped into three administrative units, simply called the North La Union Main Campus (DMMMSU-NLUC), the Mid La Union Campus (DMMMSU-MLUC), and the South La Union Campus (DMMMSU-SLUC). Each unit is headed by a chancellor, while the whole system is headed by the university president Atty. Benjamin P. Sapitula (fifth university president).