Indiana Landmarks is a private non-governmental heritage preservation organization focused on the U.S. state of Indiana. It is America's largest private statewide historic preservation organization. Founded in 1960 as Historic Landmarks Foundation of Indiana by a volunteer group of civic and business leaders led by Indianapolis pharmaceutical executive Eli Lilly, it has nearly 6,000 members. At the end of 2023, an independent auditor reported a total endowment of 67.8 million for the organization. The organization simplified its name to Indiana Landmarks in 2010.