Illinois Historic Preservation Division

The Illinois Historic Preservation Division, formerly Illinois Historic Preservation Agency, is governmental agency of the U.S. state of Illinois, and is a division of the Illinois Department of Natural Resources. It is tasked with the duty of maintaining State-owned historic sites, and maximizing their educational and recreational value to visitors or on-line users. In addition, it manages the process for applications within the state for additions to the National Register of Historic Places.

The Illinois Historic Preservation Agency (IHPA) was created by State law in July 1985. The agency's oldest bureau, the Illinois State Historical Library, was created in 1889, but the origins of the agency could be said to date back to the creation of Lincoln's Tomb for the burial of U.S. President Abraham Lincoln in Springfield, Illinois, in 1865.

During the 20th century, the state of Illinois acquired and restored a wide variety of historic properties throughout the state. One key asset, Lincoln's New Salem State Historic Site in Menard County, a reconstruction of a village where Abraham Lincoln lived in the 1830s, was established in the 1930s. The agency also administers the Cahokia World Heritage Site which includes the largest pre-columbian construction in the Americas north of Mexico.

The IHPA continued to grow after its creation in 1985, largely because of continued public interest in Lincoln as the bicentennial of his birth approached in 2009. The Abraham Lincoln Presidential Library and Museum (ALPLM), also in Springfield, Illinois, was dedicated in 2005. Unlike most presidential libraries, the Lincoln Library is state-owned.

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